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How to use ssh to encrypt X sessions, execute remote command, and perform port forwarding, etc...
If you just want to run a quick command on a remote machine, it can be faster to just run the command and skip getting a shell on the remote machine. There's no need to log in if you just want to make a quick edit to a file, or just run one command, right? SSH allows you do to this pretty easily. The syntax is ssh user@host command . For instance, if you want to restart Apache on a remote machine without logging in, you could run the following:
ssh user@webserver sudo /etc/init.d/apache2 restart
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