cd into the directory you want to test commands.

bash

for i in ls

do

$i --help >/dev/null 2>&1 && echo $i

done

any command which honors a --help will get listed. I suppose you could add a >> /tmp/output after the echo $i to log it. run it in /bin, /usr/bin, usr/local/bin

ah …and that ls in the commands listed above is a backtick ls backtick. backtick is the key in the upper left hand corner of the keyboard which shares a key with ~