QUICKLY ADD YOUR PUBLIC KEY TO AN AUTHORIZED KEYS FILE

This will add your public ssh key to an authorized keys file on a remote server for passwordless login.
Change id_dsa.pub to wherever you stored your public key from ssh-keygen.

ssh-keygen -t dsa -f ~/.ssh/id_dsa -P ''
ssh $user@$host 'mkdir ~/.ssh;echo '`cat ~/.ssh/id_dsa.pub`' >>~/.ssh/authorized_keys'