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Program that logs in on remote computer via ssh and executes commands on it

I am a network administrator and i want to write a program that can log in on remote computers via ssh and then execute certain commands on it.

What i want to know is:
1. how to make the program log in.
2. how to execute the commands.

Simple.
First configure a public/private key pair for passwordless ssh-logins. This is what you need before you can write unattended scripts.
Look at these google hits, the process is well-documented: ssh private key setup

Once you have a key - assume that the key for your remote ssh server is "/home/alien/.ssh/myremoteserver" - you use a "here-document" to run the remote commands:

Code:

ssh -i "/home/alien/.ssh/myremoteserver" -l alien some.remote.net <<EOT

ls

cd public_html

ls -la

EOT

Using ssh-keys it is also possible to copy files between the two sites unattended (nice for backups):

Code:

rsync -va -e "ssh -i /home/alien/.ssh/myremoteserver -l alien" some.remote.net:mydailybackup_20070908.tar.gz .

Eric

not a networking question. moved to Linux - software. additionally you might like to look at a tool like dsh which allows you do do as above to multiple systems at once.