I’ve found a great way to have fun with your linux server. First of all, install cowsay. If you use Ubuntu server or Debian, you can use apt-get install it:
sudo apt-get install cowsay
Now, you have to wait for another user to connect to the server via ssh. You can use the who command to see who is logged in. With two open terminals on my Ubuntu box, who’s output looks something like this.
tudor@thor:~$ who tudor tty7 2009-06-17 20:31 (:0) tudor pts/0 2009-06-17 20:36 (:0.0) tudor pts/2 2009-06-17 22:21 (:0.0)
Let’s assume that the victim is the one using the first terminal, pts/0. Now, all you have to do is punch the following like in your terminal:
cowsay -f tux "I see you" > /dev/pts/0
…and his terminal will look like this:

Doesn’t this make you feel better about yourself?
Later edit: the party continues here!
PS: this requires root level access
This is something that clearly can be categorized as BOFH!
Niiiiiiiiice!
)
I can do both cowsay and fortune as a ‘user’ but not as ‘root’. Both were installed via root apt-get install cowsay fortune
But when trying either cmd as root I get:
-bash: cowsay: command not found
-bash: fortune: command not found
any ideas?
Thank you!
What distro are you using?
Oops my bad Tudor, I see you looking at me like that lol…
Linux Debian 5.0.1 Lenny
Did you “sudo apt-get install” them?