pslog

to be able to connect to an other linux box from one box without entering your password all the time do the folowing:

login to the connecting computer as the user who will later connect to the other box.
execute

ssh-keygen -t rsa

and accept all defaults. you must leave the passphrase blank as well, otherwhise you’re going to be asked for that all the time, so it doesn’t do any good.

now you should have some files in your user’s home directory in .ssh/
id_rsa
id_rsa.pub
known_hosts

now we need to copy id_rsa.pub (your public key) to the server you want to connect to. to connect to the server, you have to use the user you want to be logged in as later on.

scp .ssh/id_rsa.pub username@server:~/

now connect to the server through ssh and add the contents of the copied file to your ~/.ssh/authorized_keys2
if this is the first time you do that, then you have to create both, the directory and the file.

ssh username@server
cat id_rsa.pub >> .ssh/authorized_keys2
exit

and now you should be able to login through

ssh username@server 

without a password prompt

more detailed infos in german can be found here:
http://www.kriegisch.at/~adi/docs/unix/ssh_autologin.html