Showing posts with label linux scp. Show all posts
Showing posts with label linux scp. Show all posts

Wednesday, May 15, 2013

Trying to copy a file from one Linux box to another. Keep getting FIle Too Large error.?

Q. I have tried rsync, SSH, SCP, and even ssh user@remotehost -C "cat /path/to/bigfile" | dd of=bigfile. They all crap out at about 16 or 17GB with a file too large error. I'm out of my mind, no idea what to try next.
Compressing the file is not an option.
The drive is not out of space, it's a 1.9TB (terrabyte) LVM with 788GB free.

A. compress the file ---try this free one from iboit---- winrar

Good interoperating system webserver?
Q. I've recently built a new computer and decided to use my old one as a file server for our house. We have a variety of devices and I was wondering what a good suggestion for a server would be?

The computers we have are:

2x Windows XP home
1x Windows XP Pro
1x Windows Vista Home
3x GNU/Linux
I also have a ps3

The server itself will be running opensuse 11 since i use that myself and know how to configure it easily. These are the file servers i'm thinking of:

ftp with a http interface for downloads
pros - Works on all client systems with no setup
cons - It's a bugger to set-up server side and keep also ftp can be quite slow.

nfs
pros - Fast, secure, easy for the Linux boxes to setup but i can't find a decent free windows client.

Samba (windows file-sharing) -
pros - um... no software to install on the windows systems
cons - with 4 different operating systems it is very temperamental impossible to set up on linux and be ale to see and access all the other computers.

None of the above are perfect worst comes to worst i can use ftp but I'd rather have a system which:

Both windows and linux can access without too much hassle.
Fast file transfer.
I can setup and leave running for months at a time without needing to configure or check.

Cheers in advance.

Mike.

A. I would use linux and just setup a scp client on Windows (eg. winscp) You have a small set of machines so it doesn't really matter either way.

How to test bandwidth/capacity of a router/network?
Q. Hi, I'm running a Starcraft II tournament that will require 8-10 computers that will be connected to the Internet at the same time, playing 4 head to head games simultaneously. Last tournament, the internet would crash during gameplay, when all 8 computers were running and we had to settle with playing with only 2 matches at the same time.

The network consisted of a DD-WRT WRT54GS connected to another router (supplying the internet connection) via DD-WRT's Wireless Bridge function. This allowed us to move the router to the front of the building while maintaining a network connection. All of the computers were hooked up to a cheap switch via 10/100 ethernet which was then hooked up to the DD-WRT router via 10/100 ethernet. I noticed that when our network crashed and the internet connection ceased, the DD-WRT router needed a restart in order to get back up.

I need a way to test the network or router's capacity. Are there any (free) utilities out there that I can use to simulate network load to find the breaking point? What can I do to prevent the router from crashing, and what are causes of it crashing? This has happened before on the same router, but with regular home usage. Even with DD-WRT the WRT54GS is pretty unreliable.

A. If you can put a linux box on each side of the router, use the iperf utility to test raw throughput. You could pull this off with 2 laptops with live ubuntu cd's or whatever.

If you are smart enough to be rolling DD-WRT then you can handle this.

Pick one box to be the server, one to be the client. then reverse it.
iperf -s on the server
iperf -c ip.address.of.server

or, you could time copying of files over SCP, but then you are adding disk io into the mix. iperf doesn't use any disk. should be pretty close and good for saturation testing.

in my experience, dd-wrt as awesome as it is seems to choke over time with lots of UDP or billions of tcp connections (a la bit torrent).

you *could* take a crappy computer and make a linux router out of it or install pfSense (a BSD distro made specifically to be a router). either way it would likely outperform dd-wrt, although it is more work.

ubuntu with 2 nic's can make a dang good router without much difficulty at all.



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Saturday, May 11, 2013

Is there a way to easily shutdown a remote linux server with a shell script?

Q. I have 3 linux servers hooked to my UPS. I can only hook the UPS to one of them. The UPS software will allow me to run a shell script on that one server before it shuts down. And I want that shell script to shut down the other 2 servers. Is this possible?
@ Roland J: I AM FULLY AWARE OF HOW TO SHUTDOWN A LINUX MACHINE.

@ Roland J: Please donât answer a question unless you actually READ the question!!!!! It makes other people think the question is answered, when in reality, your just lazy to even read the full title of the question. (or you donât know what the word âremoteâ means)

I need to know how to shutdown a linux machine REMOTELY.

This means that I want to run a script on LinuxBox1 and have LinuxBox2 (another linux server on same LAN) shut down.

A. Actually SSH would have to be set up first to allow passwordless, login between servers.

I found the solution else where, and just wanted to post it here, in case anyone else stubles on this question looking for an answer.

NOTE: IN THE RESOLUTION BELOW MANY OF THE COMMANDS ARE CUT OFF, OR INCORECTULY SHOW AS TWO LINES. FOLLOW THIS LINK FOR A PROPERLY FORMATED ANSWER.
http://www.justlinux.com/forum/showthread.php?p=863427#post863427

RESOLUTION:
Here's what I did...

First I ssh'd from each machine to each other one. (The first time u ssh to new machine it asked you to accept the machines "fingerprint" and saves it -- this is just so they know who each other are.

Then on the machine I wanted to be able to shutdown FROM I did
[CODE]
cd /root/.ssh/
ssh-keygen -t rsa
[/CODE]
and accepted the default location. (/root/.ssh/id_rsa)
I left the passphrase blank, so it would not be required.

Then basically you just need to copy that "id_rsa" file onto the DESTINATION machine, in the same directory, but named as "authorized_keys". Which can easily be done like this:
[CODE]
scp id_rsa.pub xxx.xxx.xxx.xxx:/root/.ssh/authorized_keys [/CODE]
Where xxx.xxx.xxx.xxx is the IP address or host name of remote machine.

[INDENT]NOTE: You may want to check if a file by that name already exists, on the remote machine, because the above command will overwrite it without warning. -- If you already have a file by that name on the remote machine, I would suggest using command above, but change the file name. Then on the remote machine, append the file you just copied to the existing one. This could easily be done like this: (there may be an even simpler way - but this is what I know)

[CODE]mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys.backup
cat /root/.ssh/authorized_keys.backup /root/.ssh/yourfilename > /root/.ssh/authorized_keys
[/CODE]
[/INDENT]

Then make sure the /root/.ssh/authorized_keys file has 600 permissions.
[CODE]
chmod 600 /root/.ssh/authorized_ keys
[/CODE]

Then try to ssh to the remote machine.
[CODE]
ssh xxx.xxx.xxx.xxx
[/CODE]
And if it works like it did for me -- it will let you right in, with no username or password. If this works correctly, you should be able to remotely run commands through ssh within scripts.

scp files from my school computer to my home computer?
Q. I just purchased an iMac for my home office and I want to copy files from my Linux machine at school to my iMac at home. My iMac is on a wireless router. I open up a terminal and use ssh, but I'm having issues copying files over. I tried scp filename username@home_ip_address:~ but it doesn't work. Any suggestions?

A. on your imac:
scp your_school_account@ \
your_school_machine:/home/juan/filename .
(two lines because Yahoo Answers didn't display it right)

or Charlie Kelly's method:
sftp your_school_account@your_school_machine
get filename

another option is to use a GUI if you prefer:
download Cyberduck, a free FTP client for Macs

How would you go about this linux task?
Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.



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Saturday, April 27, 2013

How do I upload a folder recursively via SSH through a linux terminal?

Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).

How do I transfer files to and from my computer I'm remotely connected to through SSH?
Q. I want to be able to transfer files to and from my home computer remotely while accessing it from an SSH connection...How do I do this? Do I need to set up an FTP server on my home computer? It's running Debian Linux and I access it from my Android phone using ConnectBot.

A. If it's running an ssh server that will include scp and usually sftp.
You can connect with any scp/sftp client like winscp, rsync. If you set up SSH keys access you need not bother with passwords (though it's still a good idea to have some passphrase in case you lose the phone)

ftp is less secure, unless you use SSL

I am accessing my home linux box remotely from work. How can I copy files from that linux comp to my local com
Q. I am accessing my home linux computer remotely from my MacBook via SSH. I am behind a NAT, so I don't have a static IP. I want to retrieve some files from that linux box to my MacBook. Is there a reverse SCP command that I can use so that I can SCP the file from my home linux box to my MacBook at work through the already established tunnel?

A. You use scp direct (not through the tunnel). It can copy either way. One option is to log in to your Linux box through ssh, then use scp to the Mac from there. you would need the address of the mac, and forwarding set up at its' router. Alternatively use the scp from the mac console to your Linux machine. You must have its' address if you can ssh to it.



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Wednesday, April 10, 2013

How do I upload a folder recursively via SSH through a linux terminal?

Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).

How do I transfer files to and from my computer I'm remotely connected to through SSH?
Q. I want to be able to transfer files to and from my home computer remotely while accessing it from an SSH connection...How do I do this? Do I need to set up an FTP server on my home computer? It's running Debian Linux and I access it from my Android phone using ConnectBot.

A. If it's running an ssh server that will include scp and usually sftp.
You can connect with any scp/sftp client like winscp, rsync. If you set up SSH keys access you need not bother with passwords (though it's still a good idea to have some passphrase in case you lose the phone)

ftp is less secure, unless you use SSL

I am accessing my home linux box remotely from work. How can I copy files from that linux comp to my local com
Q. I am accessing my home linux computer remotely from my MacBook via SSH. I am behind a NAT, so I don't have a static IP. I want to retrieve some files from that linux box to my MacBook. Is there a reverse SCP command that I can use so that I can SCP the file from my home linux box to my MacBook at work through the already established tunnel?

A. You use scp direct (not through the tunnel). It can copy either way. One option is to log in to your Linux box through ssh, then use scp to the Mac from there. you would need the address of the mac, and forwarding set up at its' router. Alternatively use the scp from the mac console to your Linux machine. You must have its' address if you can ssh to it.



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Friday, April 5, 2013

How to save file to desktop using Linux commands.?

Q. I am a beginner to Linux commands. I use SSH to connect to a Linux server. What command can I use to save a text file on the server to my desktop? Example?

A. From your desktop, fire up a terminal, or use Cygwin if you're under Windows (make sure you have installed the openssh packages) :

scp <your_user_name>@<server_name>:<path to remote file> <path to local dir/file>

Enter your password, and you're done :)

How hard is it to run a secure Linux server, with Apache, PHP, MySQL, and mail services?
Q. I will be getting my own dedicated server soon and while I have a functional knowledge of the concepts of Linux, I don't know everything. Will my server be reasonably secure if I am sure to keep everything updated and patched (assume there are no PHP scripts vulnerable to SQL injection etc.)

A. Make sure you have strong passwords for everything. This includes your database. Use SSH to connect, scp or some other secure program to transfer files (not vanilla FTP, since it transmits passwords in the clear).
If your database doesn't need to talk to other hosts, configure it so it only listens on the loopback interface.
Be careful when configuring your mail server, so it isn't an open relay.
Get a cert for the web server, so you can use SSL to protect information that gets sent over the net.

The biggest potential source of vulnerabilities will be from whatever web apps you install. Subscribe to the announcement/security mailing list(s) for those apps (and for the Linux distro you use), so you don't get blindsided. Before you install something, you might want to check out a security site (like Secunia) and search to see what advisories have been issued for that software w/in the recent past. This will give you an idea about just how worried you should be about potential issues down the road (and what current issues there are that haven't been fixed, yet).

If you're rolling your own web apps, there are a whole bunch of things to watch out for, especially if you're doing things with user data (file uploads, SQL searches, form processing, etc).

How do I upload a folder recursively via SSH through a linux terminal?
Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).



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Wednesday, March 27, 2013

How would you go about this linux task?

Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.

How do I turn my Ubuntu/Linux PC into a server for my Windows 7 PC?
Q. Is this a good idea? Will my Windows PC get extra protection since I will be going on the Internet using the Ubuntu as a server, as an intermediary? How difficult is it to do this?

A. This question is pretty poorly designed. There is no "Server for windows" in Linux. You can do several things with linux and connect/use them from windows though. You can make linux a firewall and router, connect it to your cable/dsl modem so you can have multiple computers use your internet connection at one time. You can run web, ftp, and other servers for files and web pages. You can also run Samba which allows you to access and store files on the linux hard driver over the network. linux also makes a GREAT extension to your windows environment using things like xdmcp, rdp, ssh, scp. if you do not know what any of these terms are, google is your buddy. You can also set up a web proxy using linux and this could definitely be used to increase your web browsing security in windows by blocking malicious web sites. Pretty much anything you want to do with Linux is limited by you and your willingness to learn.

Nothing is simple click and go in linux. You have to be willing to experiemnt, read, and learn.

How do you transfer files from the command line in Red Hat Linux?
Q. I'm trying to transfer files from a Fedora Core to the host server, which is a Red Hat v 8. How do I do it from the command line?

A. Well there are several ways to do this. They depend on what servers are running on the host machine. If you can ssh to the host server, then the best way is "scp <filename> <host machine>:<filename>". If this is not setup you can try ftp or one of the disk sharing protocols like Samba or NFS.



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Saturday, March 2, 2013

Is there a way to easily shutdown a remote linux server with a shell script?

Q. I have 3 linux servers hooked to my UPS. I can only hook the UPS to one of them. The UPS software will allow me to run a shell script on that one server before it shuts down. And I want that shell script to shut down the other 2 servers. Is this possible?
@ Roland J: I AM FULLY AWARE OF HOW TO SHUTDOWN A LINUX MACHINE.

@ Roland J: Please donât answer a question unless you actually READ the question!!!!! It makes other people think the question is answered, when in reality, your just lazy to even read the full title of the question. (or you donât know what the word âremoteâ means)

I need to know how to shutdown a linux machine REMOTELY.

This means that I want to run a script on LinuxBox1 and have LinuxBox2 (another linux server on same LAN) shut down.

A. Actually SSH would have to be set up first to allow passwordless, login between servers.

I found the solution else where, and just wanted to post it here, in case anyone else stubles on this question looking for an answer.

NOTE: IN THE RESOLUTION BELOW MANY OF THE COMMANDS ARE CUT OFF, OR INCORECTULY SHOW AS TWO LINES. FOLLOW THIS LINK FOR A PROPERLY FORMATED ANSWER.
http://www.justlinux.com/forum/showthread.php?p=863427#post863427

RESOLUTION:
Here's what I did...

First I ssh'd from each machine to each other one. (The first time u ssh to new machine it asked you to accept the machines "fingerprint" and saves it -- this is just so they know who each other are.

Then on the machine I wanted to be able to shutdown FROM I did
[CODE]
cd /root/.ssh/
ssh-keygen -t rsa
[/CODE]
and accepted the default location. (/root/.ssh/id_rsa)
I left the passphrase blank, so it would not be required.

Then basically you just need to copy that "id_rsa" file onto the DESTINATION machine, in the same directory, but named as "authorized_keys". Which can easily be done like this:
[CODE]
scp id_rsa.pub xxx.xxx.xxx.xxx:/root/.ssh/authorized_keys [/CODE]
Where xxx.xxx.xxx.xxx is the IP address or host name of remote machine.

[INDENT]NOTE: You may want to check if a file by that name already exists, on the remote machine, because the above command will overwrite it without warning. -- If you already have a file by that name on the remote machine, I would suggest using command above, but change the file name. Then on the remote machine, append the file you just copied to the existing one. This could easily be done like this: (there may be an even simpler way - but this is what I know)

[CODE]mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys.backup
cat /root/.ssh/authorized_keys.backup /root/.ssh/yourfilename > /root/.ssh/authorized_keys
[/CODE]
[/INDENT]

Then make sure the /root/.ssh/authorized_keys file has 600 permissions.
[CODE]
chmod 600 /root/.ssh/authorized_ keys
[/CODE]

Then try to ssh to the remote machine.
[CODE]
ssh xxx.xxx.xxx.xxx
[/CODE]
And if it works like it did for me -- it will let you right in, with no username or password. If this works correctly, you should be able to remotely run commands through ssh within scripts.

scp files from my school computer to my home computer?
Q. I just purchased an iMac for my home office and I want to copy files from my Linux machine at school to my iMac at home. My iMac is on a wireless router. I open up a terminal and use ssh, but I'm having issues copying files over. I tried scp filename username@home_ip_address:~ but it doesn't work. Any suggestions?

A. on your imac:
scp your_school_account@ \
your_school_machine:/home/juan/filename .
(two lines because Yahoo Answers didn't display it right)

or Charlie Kelly's method:
sftp your_school_account@your_school_machine
get filename

another option is to use a GUI if you prefer:
download Cyberduck, a free FTP client for Macs

How would you go about this linux task?
Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.



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Friday, February 22, 2013

Is there a way to easily shutdown a remote linux server with a shell script?

Q. I have 3 linux servers hooked to my UPS. I can only hook the UPS to one of them. The UPS software will allow me to run a shell script on that one server before it shuts down. And I want that shell script to shut down the other 2 servers. Is this possible?
@ Roland J: I AM FULLY AWARE OF HOW TO SHUTDOWN A LINUX MACHINE.

@ Roland J: Please donât answer a question unless you actually READ the question!!!!! It makes other people think the question is answered, when in reality, your just lazy to even read the full title of the question. (or you donât know what the word âremoteâ means)

I need to know how to shutdown a linux machine REMOTELY.

This means that I want to run a script on LinuxBox1 and have LinuxBox2 (another linux server on same LAN) shut down.

A. Actually SSH would have to be set up first to allow passwordless, login between servers.

I found the solution else where, and just wanted to post it here, in case anyone else stubles on this question looking for an answer.

NOTE: IN THE RESOLUTION BELOW MANY OF THE COMMANDS ARE CUT OFF, OR INCORECTULY SHOW AS TWO LINES. FOLLOW THIS LINK FOR A PROPERLY FORMATED ANSWER.
http://www.justlinux.com/forum/showthread.php?p=863427#post863427

RESOLUTION:
Here's what I did...

First I ssh'd from each machine to each other one. (The first time u ssh to new machine it asked you to accept the machines "fingerprint" and saves it -- this is just so they know who each other are.

Then on the machine I wanted to be able to shutdown FROM I did
[CODE]
cd /root/.ssh/
ssh-keygen -t rsa
[/CODE]
and accepted the default location. (/root/.ssh/id_rsa)
I left the passphrase blank, so it would not be required.

Then basically you just need to copy that "id_rsa" file onto the DESTINATION machine, in the same directory, but named as "authorized_keys". Which can easily be done like this:
[CODE]
scp id_rsa.pub xxx.xxx.xxx.xxx:/root/.ssh/authorized_keys [/CODE]
Where xxx.xxx.xxx.xxx is the IP address or host name of remote machine.

[INDENT]NOTE: You may want to check if a file by that name already exists, on the remote machine, because the above command will overwrite it without warning. -- If you already have a file by that name on the remote machine, I would suggest using command above, but change the file name. Then on the remote machine, append the file you just copied to the existing one. This could easily be done like this: (there may be an even simpler way - but this is what I know)

[CODE]mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys.backup
cat /root/.ssh/authorized_keys.backup /root/.ssh/yourfilename > /root/.ssh/authorized_keys
[/CODE]
[/INDENT]

Then make sure the /root/.ssh/authorized_keys file has 600 permissions.
[CODE]
chmod 600 /root/.ssh/authorized_ keys
[/CODE]

Then try to ssh to the remote machine.
[CODE]
ssh xxx.xxx.xxx.xxx
[/CODE]
And if it works like it did for me -- it will let you right in, with no username or password. If this works correctly, you should be able to remotely run commands through ssh within scripts.

scp files from my school computer to my home computer?
Q. I just purchased an iMac for my home office and I want to copy files from my Linux machine at school to my iMac at home. My iMac is on a wireless router. I open up a terminal and use ssh, but I'm having issues copying files over. I tried scp filename username@home_ip_address:~ but it doesn't work. Any suggestions?

A. on your imac:
scp your_school_account@ \
your_school_machine:/home/juan/filename .
(two lines because Yahoo Answers didn't display it right)

or Charlie Kelly's method:
sftp your_school_account@your_school_machine
get filename

another option is to use a GUI if you prefer:
download Cyberduck, a free FTP client for Macs

How would you go about this linux task?
Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.



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Monday, February 18, 2013

How hard is it to run a secure Linux server, with Apache, PHP, MySQL, and mail services?

Q. I will be getting my own dedicated server soon and while I have a functional knowledge of the concepts of Linux, I don't know everything. Will my server be reasonably secure if I am sure to keep everything updated and patched (assume there are no PHP scripts vulnerable to SQL injection etc.)

A. Make sure you have strong passwords for everything. This includes your database. Use SSH to connect, scp or some other secure program to transfer files (not vanilla FTP, since it transmits passwords in the clear).
If your database doesn't need to talk to other hosts, configure it so it only listens on the loopback interface.
Be careful when configuring your mail server, so it isn't an open relay.
Get a cert for the web server, so you can use SSL to protect information that gets sent over the net.

The biggest potential source of vulnerabilities will be from whatever web apps you install. Subscribe to the announcement/security mailing list(s) for those apps (and for the Linux distro you use), so you don't get blindsided. Before you install something, you might want to check out a security site (like Secunia) and search to see what advisories have been issued for that software w/in the recent past. This will give you an idea about just how worried you should be about potential issues down the road (and what current issues there are that haven't been fixed, yet).

If you're rolling your own web apps, there are a whole bunch of things to watch out for, especially if you're doing things with user data (file uploads, SQL searches, form processing, etc).

How do I upload a folder recursively via SSH through a linux terminal?
Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).

How do I transfer files to and from my computer I'm remotely connected to through SSH?
Q. I want to be able to transfer files to and from my home computer remotely while accessing it from an SSH connection...How do I do this? Do I need to set up an FTP server on my home computer? It's running Debian Linux and I access it from my Android phone using ConnectBot.

A. If it's running an ssh server that will include scp and usually sftp.
You can connect with any scp/sftp client like winscp, rsync. If you set up SSH keys access you need not bother with passwords (though it's still a good idea to have some passphrase in case you lose the phone)

ftp is less secure, unless you use SSL



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Sunday, February 17, 2013

How hard is it to run a secure Linux server, with Apache, PHP, MySQL, and mail services?

Q. I will be getting my own dedicated server soon and while I have a functional knowledge of the concepts of Linux, I don't know everything. Will my server be reasonably secure if I am sure to keep everything updated and patched (assume there are no PHP scripts vulnerable to SQL injection etc.)

A. Make sure you have strong passwords for everything. This includes your database. Use SSH to connect, scp or some other secure program to transfer files (not vanilla FTP, since it transmits passwords in the clear).
If your database doesn't need to talk to other hosts, configure it so it only listens on the loopback interface.
Be careful when configuring your mail server, so it isn't an open relay.
Get a cert for the web server, so you can use SSL to protect information that gets sent over the net.

The biggest potential source of vulnerabilities will be from whatever web apps you install. Subscribe to the announcement/security mailing list(s) for those apps (and for the Linux distro you use), so you don't get blindsided. Before you install something, you might want to check out a security site (like Secunia) and search to see what advisories have been issued for that software w/in the recent past. This will give you an idea about just how worried you should be about potential issues down the road (and what current issues there are that haven't been fixed, yet).

If you're rolling your own web apps, there are a whole bunch of things to watch out for, especially if you're doing things with user data (file uploads, SQL searches, form processing, etc).

How do I upload a folder recursively via SSH through a linux terminal?
Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).

How do I transfer files to and from my computer I'm remotely connected to through SSH?
Q. I want to be able to transfer files to and from my home computer remotely while accessing it from an SSH connection...How do I do this? Do I need to set up an FTP server on my home computer? It's running Debian Linux and I access it from my Android phone using ConnectBot.

A. If it's running an ssh server that will include scp and usually sftp.
You can connect with any scp/sftp client like winscp, rsync. If you set up SSH keys access you need not bother with passwords (though it's still a good idea to have some passphrase in case you lose the phone)

ftp is less secure, unless you use SSL



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Thursday, February 14, 2013

How hard is it to run a secure Linux server, with Apache, PHP, MySQL, and mail services?

Q. I will be getting my own dedicated server soon and while I have a functional knowledge of the concepts of Linux, I don't know everything. Will my server be reasonably secure if I am sure to keep everything updated and patched (assume there are no PHP scripts vulnerable to SQL injection etc.)

A. Make sure you have strong passwords for everything. This includes your database. Use SSH to connect, scp or some other secure program to transfer files (not vanilla FTP, since it transmits passwords in the clear).
If your database doesn't need to talk to other hosts, configure it so it only listens on the loopback interface.
Be careful when configuring your mail server, so it isn't an open relay.
Get a cert for the web server, so you can use SSL to protect information that gets sent over the net.

The biggest potential source of vulnerabilities will be from whatever web apps you install. Subscribe to the announcement/security mailing list(s) for those apps (and for the Linux distro you use), so you don't get blindsided. Before you install something, you might want to check out a security site (like Secunia) and search to see what advisories have been issued for that software w/in the recent past. This will give you an idea about just how worried you should be about potential issues down the road (and what current issues there are that haven't been fixed, yet).

If you're rolling your own web apps, there are a whole bunch of things to watch out for, especially if you're doing things with user data (file uploads, SQL searches, form processing, etc).

How do I upload a folder recursively via SSH through a linux terminal?
Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).

How do I transfer files to and from my computer I'm remotely connected to through SSH?
Q. I want to be able to transfer files to and from my home computer remotely while accessing it from an SSH connection...How do I do this? Do I need to set up an FTP server on my home computer? It's running Debian Linux and I access it from my Android phone using ConnectBot.

A. If it's running an ssh server that will include scp and usually sftp.
You can connect with any scp/sftp client like winscp, rsync. If you set up SSH keys access you need not bother with passwords (though it's still a good idea to have some passphrase in case you lose the phone)

ftp is less secure, unless you use SSL



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Tuesday, January 29, 2013

How do I turn my Ubuntu/Linux PC into a server for my Windows 7 PC?

Q. Is this a good idea? Will my Windows PC get extra protection since I will be going on the Internet using the Ubuntu as a server, as an intermediary? How difficult is it to do this?

A. This question is pretty poorly designed. There is no "Server for windows" in Linux. You can do several things with linux and connect/use them from windows though. You can make linux a firewall and router, connect it to your cable/dsl modem so you can have multiple computers use your internet connection at one time. You can run web, ftp, and other servers for files and web pages. You can also run Samba which allows you to access and store files on the linux hard driver over the network. linux also makes a GREAT extension to your windows environment using things like xdmcp, rdp, ssh, scp. if you do not know what any of these terms are, google is your buddy. You can also set up a web proxy using linux and this could definitely be used to increase your web browsing security in windows by blocking malicious web sites. Pretty much anything you want to do with Linux is limited by you and your willingness to learn.

Nothing is simple click and go in linux. You have to be willing to experiemnt, read, and learn.

How do you transfer files from the command line in Red Hat Linux?
Q. I'm trying to transfer files from a Fedora Core to the host server, which is a Red Hat v 8. How do I do it from the command line?

A. Well there are several ways to do this. They depend on what servers are running on the host machine. If you can ssh to the host server, then the best way is "scp <filename> <host machine>:<filename>". If this is not setup you can try ftp or one of the disk sharing protocols like Samba or NFS.

How do I copy files from a linux server to my local machine w command line?
Q. I have logged in using ssh and now want to copy several directories off the server to my local machine.

I attempted with "cp <destination file> <local machine>:<source file>" am I on the right track?

A. Yes, you're on the right track. "scp" is a combination of "ssh" and "cp". On your local machine, you can say

scp <remote machine>:<source file> <destination file>

to grab the file from the Linux server (or any other machine with an ssh server running).

Oops - here is more info:

You said you want to copy several directories. To copy an entire directory with scp, you can use the "-r" flag like this:

scp -r <remote machine>:<source directory> <destination directory>

That will copy the directory and all files and subdirectories under it to your local system.



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Sunday, January 27, 2013

How would you go about this linux task?

Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.

How do I turn my Ubuntu/Linux PC into a server for my Windows 7 PC?
Q. Is this a good idea? Will my Windows PC get extra protection since I will be going on the Internet using the Ubuntu as a server, as an intermediary? How difficult is it to do this?

A. This question is pretty poorly designed. There is no "Server for windows" in Linux. You can do several things with linux and connect/use them from windows though. You can make linux a firewall and router, connect it to your cable/dsl modem so you can have multiple computers use your internet connection at one time. You can run web, ftp, and other servers for files and web pages. You can also run Samba which allows you to access and store files on the linux hard driver over the network. linux also makes a GREAT extension to your windows environment using things like xdmcp, rdp, ssh, scp. if you do not know what any of these terms are, google is your buddy. You can also set up a web proxy using linux and this could definitely be used to increase your web browsing security in windows by blocking malicious web sites. Pretty much anything you want to do with Linux is limited by you and your willingness to learn.

Nothing is simple click and go in linux. You have to be willing to experiemnt, read, and learn.

How do you transfer files from the command line in Red Hat Linux?
Q. I'm trying to transfer files from a Fedora Core to the host server, which is a Red Hat v 8. How do I do it from the command line?

A. Well there are several ways to do this. They depend on what servers are running on the host machine. If you can ssh to the host server, then the best way is "scp <filename> <host machine>:<filename>". If this is not setup you can try ftp or one of the disk sharing protocols like Samba or NFS.



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Friday, January 25, 2013

How would you go about this linux task?

Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.

How do I turn my Ubuntu/Linux PC into a server for my Windows 7 PC?
Q. Is this a good idea? Will my Windows PC get extra protection since I will be going on the Internet using the Ubuntu as a server, as an intermediary? How difficult is it to do this?

A. This question is pretty poorly designed. There is no "Server for windows" in Linux. You can do several things with linux and connect/use them from windows though. You can make linux a firewall and router, connect it to your cable/dsl modem so you can have multiple computers use your internet connection at one time. You can run web, ftp, and other servers for files and web pages. You can also run Samba which allows you to access and store files on the linux hard driver over the network. linux also makes a GREAT extension to your windows environment using things like xdmcp, rdp, ssh, scp. if you do not know what any of these terms are, google is your buddy. You can also set up a web proxy using linux and this could definitely be used to increase your web browsing security in windows by blocking malicious web sites. Pretty much anything you want to do with Linux is limited by you and your willingness to learn.

Nothing is simple click and go in linux. You have to be willing to experiemnt, read, and learn.

How do you transfer files from the command line in Red Hat Linux?
Q. I'm trying to transfer files from a Fedora Core to the host server, which is a Red Hat v 8. How do I do it from the command line?

A. Well there are several ways to do this. They depend on what servers are running on the host machine. If you can ssh to the host server, then the best way is "scp <filename> <host machine>:<filename>". If this is not setup you can try ftp or one of the disk sharing protocols like Samba or NFS.



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Tuesday, January 22, 2013

How do I upload a folder recursively via SSH through a linux terminal?

Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).

How do I transfer files to and from my computer I'm remotely connected to through SSH?
Q. I want to be able to transfer files to and from my home computer remotely while accessing it from an SSH connection...How do I do this? Do I need to set up an FTP server on my home computer? It's running Debian Linux and I access it from my Android phone using ConnectBot.

A. If it's running an ssh server that will include scp and usually sftp.
You can connect with any scp/sftp client like winscp, rsync. If you set up SSH keys access you need not bother with passwords (though it's still a good idea to have some passphrase in case you lose the phone)

ftp is less secure, unless you use SSL

I am accessing my home linux box remotely from work. How can I copy files from that linux comp to my local com
Q. I am accessing my home linux computer remotely from my MacBook via SSH. I am behind a NAT, so I don't have a static IP. I want to retrieve some files from that linux box to my MacBook. Is there a reverse SCP command that I can use so that I can SCP the file from my home linux box to my MacBook at work through the already established tunnel?

A. You use scp direct (not through the tunnel). It can copy either way. One option is to log in to your Linux box through ssh, then use scp to the Mac from there. you would need the address of the mac, and forwarding set up at its' router. Alternatively use the scp from the mac console to your Linux machine. You must have its' address if you can ssh to it.



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Saturday, January 19, 2013

Is there a way to easily shutdown a remote linux server with a shell script?

Q. I have 3 linux servers hooked to my UPS. I can only hook the UPS to one of them. The UPS software will allow me to run a shell script on that one server before it shuts down. And I want that shell script to shut down the other 2 servers. Is this possible?
@ Roland J: I AM FULLY AWARE OF HOW TO SHUTDOWN A LINUX MACHINE.

@ Roland J: Please donât answer a question unless you actually READ the question!!!!! It makes other people think the question is answered, when in reality, your just lazy to even read the full title of the question. (or you donât know what the word âremoteâ means)

I need to know how to shutdown a linux machine REMOTELY.

This means that I want to run a script on LinuxBox1 and have LinuxBox2 (another linux server on same LAN) shut down.

A. Actually SSH would have to be set up first to allow passwordless, login between servers.

I found the solution else where, and just wanted to post it here, in case anyone else stubles on this question looking for an answer.

NOTE: IN THE RESOLUTION BELOW MANY OF THE COMMANDS ARE CUT OFF, OR INCORECTULY SHOW AS TWO LINES. FOLLOW THIS LINK FOR A PROPERLY FORMATED ANSWER.
http://www.justlinux.com/forum/showthread.php?p=863427#post863427

RESOLUTION:
Here's what I did...

First I ssh'd from each machine to each other one. (The first time u ssh to new machine it asked you to accept the machines "fingerprint" and saves it -- this is just so they know who each other are.

Then on the machine I wanted to be able to shutdown FROM I did
[CODE]
cd /root/.ssh/
ssh-keygen -t rsa
[/CODE]
and accepted the default location. (/root/.ssh/id_rsa)
I left the passphrase blank, so it would not be required.

Then basically you just need to copy that "id_rsa" file onto the DESTINATION machine, in the same directory, but named as "authorized_keys". Which can easily be done like this:
[CODE]
scp id_rsa.pub xxx.xxx.xxx.xxx:/root/.ssh/authorized_keys [/CODE]
Where xxx.xxx.xxx.xxx is the IP address or host name of remote machine.

[INDENT]NOTE: You may want to check if a file by that name already exists, on the remote machine, because the above command will overwrite it without warning. -- If you already have a file by that name on the remote machine, I would suggest using command above, but change the file name. Then on the remote machine, append the file you just copied to the existing one. This could easily be done like this: (there may be an even simpler way - but this is what I know)

[CODE]mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys.backup
cat /root/.ssh/authorized_keys.backup /root/.ssh/yourfilename > /root/.ssh/authorized_keys
[/CODE]
[/INDENT]

Then make sure the /root/.ssh/authorized_keys file has 600 permissions.
[CODE]
chmod 600 /root/.ssh/authorized_ keys
[/CODE]

Then try to ssh to the remote machine.
[CODE]
ssh xxx.xxx.xxx.xxx
[/CODE]
And if it works like it did for me -- it will let you right in, with no username or password. If this works correctly, you should be able to remotely run commands through ssh within scripts.

scp files from my school computer to my home computer?
Q. I just purchased an iMac for my home office and I want to copy files from my Linux machine at school to my iMac at home. My iMac is on a wireless router. I open up a terminal and use ssh, but I'm having issues copying files over. I tried scp filename username@home_ip_address:~ but it doesn't work. Any suggestions?

A. on your imac:
scp your_school_account@ \
your_school_machine:/home/juan/filename .
(two lines because Yahoo Answers didn't display it right)

or Charlie Kelly's method:
sftp your_school_account@your_school_machine
get filename

another option is to use a GUI if you prefer:
download Cyberduck, a free FTP client for Macs

How would you go about this linux task?
Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.



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How to save file to desktop using Linux commands.?

Q. I am a beginner to Linux commands. I use SSH to connect to a Linux server. What command can I use to save a text file on the server to my desktop? Example?

A. From your desktop, fire up a terminal, or use Cygwin if you're under Windows (make sure you have installed the openssh packages) :

scp <your_user_name>@<server_name>:<path to remote file> <path to local dir/file>

Enter your password, and you're done :)

How hard is it to run a secure Linux server, with Apache, PHP, MySQL, and mail services?
Q. I will be getting my own dedicated server soon and while I have a functional knowledge of the concepts of Linux, I don't know everything. Will my server be reasonably secure if I am sure to keep everything updated and patched (assume there are no PHP scripts vulnerable to SQL injection etc.)

A. Make sure you have strong passwords for everything. This includes your database. Use SSH to connect, scp or some other secure program to transfer files (not vanilla FTP, since it transmits passwords in the clear).
If your database doesn't need to talk to other hosts, configure it so it only listens on the loopback interface.
Be careful when configuring your mail server, so it isn't an open relay.
Get a cert for the web server, so you can use SSL to protect information that gets sent over the net.

The biggest potential source of vulnerabilities will be from whatever web apps you install. Subscribe to the announcement/security mailing list(s) for those apps (and for the Linux distro you use), so you don't get blindsided. Before you install something, you might want to check out a security site (like Secunia) and search to see what advisories have been issued for that software w/in the recent past. This will give you an idea about just how worried you should be about potential issues down the road (and what current issues there are that haven't been fixed, yet).

If you're rolling your own web apps, there are a whole bunch of things to watch out for, especially if you're doing things with user data (file uploads, SQL searches, form processing, etc).

How do I upload a folder recursively via SSH through a linux terminal?
Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).



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Friday, January 18, 2013

How to save file to desktop using Linux commands.?

Q. I am a beginner to Linux commands. I use SSH to connect to a Linux server. What command can I use to save a text file on the server to my desktop? Example?

A. From your desktop, fire up a terminal, or use Cygwin if you're under Windows (make sure you have installed the openssh packages) :

scp <your_user_name>@<server_name>:<path to remote file> <path to local dir/file>

Enter your password, and you're done :)

How hard is it to run a secure Linux server, with Apache, PHP, MySQL, and mail services?
Q. I will be getting my own dedicated server soon and while I have a functional knowledge of the concepts of Linux, I don't know everything. Will my server be reasonably secure if I am sure to keep everything updated and patched (assume there are no PHP scripts vulnerable to SQL injection etc.)

A. Make sure you have strong passwords for everything. This includes your database. Use SSH to connect, scp or some other secure program to transfer files (not vanilla FTP, since it transmits passwords in the clear).
If your database doesn't need to talk to other hosts, configure it so it only listens on the loopback interface.
Be careful when configuring your mail server, so it isn't an open relay.
Get a cert for the web server, so you can use SSL to protect information that gets sent over the net.

The biggest potential source of vulnerabilities will be from whatever web apps you install. Subscribe to the announcement/security mailing list(s) for those apps (and for the Linux distro you use), so you don't get blindsided. Before you install something, you might want to check out a security site (like Secunia) and search to see what advisories have been issued for that software w/in the recent past. This will give you an idea about just how worried you should be about potential issues down the road (and what current issues there are that haven't been fixed, yet).

If you're rolling your own web apps, there are a whole bunch of things to watch out for, especially if you're doing things with user data (file uploads, SQL searches, form processing, etc).

How do I upload a folder recursively via SSH through a linux terminal?
Q. The problem is quite simple actually. I have a folder in my desktop which I want to be able to upload to my server via SSH. I want to be able to do that using only the linux terminal. Thanks
I don't know about import/export functions. I just want to upload via SSH. I know it's possible, I just don't know how.

A. See the SCP command (syntax in source link). It copies files over ssh. As you can see, it has an option to put an entire folder over at once.

Alternatively, there's SFTP (secure-ftp) which tunnels a ftp connection through ssh (valid only if the target server also has ftp service in addition to ssh).



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Tuesday, January 15, 2013

Is there a way to easily shutdown a remote linux server with a shell script?

Q. I have 3 linux servers hooked to my UPS. I can only hook the UPS to one of them. The UPS software will allow me to run a shell script on that one server before it shuts down. And I want that shell script to shut down the other 2 servers. Is this possible?
@ Roland J: I AM FULLY AWARE OF HOW TO SHUTDOWN A LINUX MACHINE.

@ Roland J: Please donât answer a question unless you actually READ the question!!!!! It makes other people think the question is answered, when in reality, your just lazy to even read the full title of the question. (or you donât know what the word âremoteâ means)

I need to know how to shutdown a linux machine REMOTELY.

This means that I want to run a script on LinuxBox1 and have LinuxBox2 (another linux server on same LAN) shut down.

A. Actually SSH would have to be set up first to allow passwordless, login between servers.

I found the solution else where, and just wanted to post it here, in case anyone else stubles on this question looking for an answer.

NOTE: IN THE RESOLUTION BELOW MANY OF THE COMMANDS ARE CUT OFF, OR INCORECTULY SHOW AS TWO LINES. FOLLOW THIS LINK FOR A PROPERLY FORMATED ANSWER.
http://www.justlinux.com/forum/showthread.php?p=863427#post863427

RESOLUTION:
Here's what I did...

First I ssh'd from each machine to each other one. (The first time u ssh to new machine it asked you to accept the machines "fingerprint" and saves it -- this is just so they know who each other are.

Then on the machine I wanted to be able to shutdown FROM I did
[CODE]
cd /root/.ssh/
ssh-keygen -t rsa
[/CODE]
and accepted the default location. (/root/.ssh/id_rsa)
I left the passphrase blank, so it would not be required.

Then basically you just need to copy that "id_rsa" file onto the DESTINATION machine, in the same directory, but named as "authorized_keys". Which can easily be done like this:
[CODE]
scp id_rsa.pub xxx.xxx.xxx.xxx:/root/.ssh/authorized_keys [/CODE]
Where xxx.xxx.xxx.xxx is the IP address or host name of remote machine.

[INDENT]NOTE: You may want to check if a file by that name already exists, on the remote machine, because the above command will overwrite it without warning. -- If you already have a file by that name on the remote machine, I would suggest using command above, but change the file name. Then on the remote machine, append the file you just copied to the existing one. This could easily be done like this: (there may be an even simpler way - but this is what I know)

[CODE]mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys.backup
cat /root/.ssh/authorized_keys.backup /root/.ssh/yourfilename > /root/.ssh/authorized_keys
[/CODE]
[/INDENT]

Then make sure the /root/.ssh/authorized_keys file has 600 permissions.
[CODE]
chmod 600 /root/.ssh/authorized_ keys
[/CODE]

Then try to ssh to the remote machine.
[CODE]
ssh xxx.xxx.xxx.xxx
[/CODE]
And if it works like it did for me -- it will let you right in, with no username or password. If this works correctly, you should be able to remotely run commands through ssh within scripts.

scp files from my school computer to my home computer?
Q. I just purchased an iMac for my home office and I want to copy files from my Linux machine at school to my iMac at home. My iMac is on a wireless router. I open up a terminal and use ssh, but I'm having issues copying files over. I tried scp filename username@home_ip_address:~ but it doesn't work. Any suggestions?

A. on your imac:
scp your_school_account@ \
your_school_machine:/home/juan/filename .
(two lines because Yahoo Answers didn't display it right)

or Charlie Kelly's method:
sftp your_school_account@your_school_machine
get filename

another option is to use a GUI if you prefer:
download Cyberduck, a free FTP client for Macs

How would you go about this linux task?
Q. 1. I must grep through executable scripts, but they don't end in .doc or .exe tag

2. the grep signature will be "rcp" other remote commands so I can change them secure commands like "scp"

Is there any way I could do this in Linux and using Perl?

A. find . -type f -perm /u+x -exec grep -l -w rcp {} \;

Find regular files starting at the current directory which are executable by the owner. When found grep on whole words of "rcp", but display only the file names.

If you really want to replace "rcp" with "scp" in all cases (not recommended because that is too sweeping), then add a sed loop. Something like this:


find . -type f -perm /u+x -exec grep -l -w rcp {} \; | while read NAME; do cat $NAME | sed -e 's/rcp /scp /g' > .tmp.$$ ; mv .tmp.$$ $NAME; done

Be SURE to test that thoroughly before trying that last bit.




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