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Enjoy a randomly generated fortune:

$ fortune | cowsay

 _________________________________________
/ Old MacLinus had a stack/l-i-n-u-x/and  \
| on this stack he had a trace/l-i-n-u-x  |
| with an Oops-Oops here and an Oops-Oops |
| there here an Oops, there an Oops,      |
| everywhere an Oops-Oops.                |
|                                         |
| -- tjimenez@site.gmu.edu,               |
\ linux.dev.kernel                        /
 -----------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Here is the PHP code:

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