copy ssh pubkey to server on one line, found this @http://www.davidgrant.ca/copy_ssh_public_key_to_server_in_one_line I got tired of trying to find the link every time

copy ssh

cat ~/.ssh/id_dsa.pub | ssh user@hostname "cat - >> ~/.ssh/authorized_keys"
alternative:
ssh user@hostname "echo `cat ~/.ssh/id_dsa.pub` >> ~/.ssh/authorized_keys"
 
 
here is another alternative I use on new servers (that don't already have an ~/.ssh directory:
cat ~/.ssh/id_dsa.pub | ssh user@hostname "mkdir ~/.ssh/; cat - >> ~/.ssh/authorized_keys"
*OR*
ssh user@hostname "mkdir ~/.ssh/; echo `cat ~/.ssh/id_dsa.pub` >> ~/.ssh/authorized_keys"
 
after this, it is necessary to set the permissions:
ssh user@hostname "chmod 700 ~/.ssh; chmod 640 ~/.ssh/authorized_keys"

or combine the first and second step if you know it's a new server:
cat ~/.ssh/id_dsa.pub | ssh user@hostname "mkdir ~/.ssh/; cat - >> ~/.ssh/authorized_keys; chmod 700 ~/.ssh; chmod 640 ~/.ssh/authorized_keys"