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Enjoy a randomly generated fortune:

$ fortune | cowsay

 _____________________________________
/ Hi! I'm a .signature virus! Copy me \
| into your ~/.signature to help me   |
\ sprea= d!                           /
 -------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Here is the PHP code:

$output = shell_exec("/usr/games/fortune | /usr/games/cowsay");
echo $output;