`$ cat .ssh/id_dsa.pub | ssh host 'cat >> ~/.ssh/authorized_keys'`

That. For MONTHS, I've been thinking "I should really switch to passwordless SSH login so when I'm pushing code to my server, I don't have to enter my password every. Single. Time." I kept putting it off because I assumed it would be complex. Guess what?

IT'S NOT.

One fun trick involving ^^:

> $ ls -al
>
> $ ^-al^-lash
> ls -lash