> There's no such thing as "Gibbon 7.1", so I don't know whether or not I
> should post the script I use to locate and list every executable in the
> $PATH. It's a really handy script, but not knowing what you're actually
> running I'd hate to give you something that might harm your system. 
As I write this reply, four other responders have answered the question
and given good and helpful advice that resolved the issue---and each of
them correctly discerned the exact version of Ubuntu that was being
discussed.
You're absolutely correct about not releasing your potentially
dangerous script. Please keep it to yourself.