The find command with the -executable flag can be used to return all of the executable files below a certain directory. In this example, every executable file below the /usr/local directory will be returned.

find /usr/local -type f -executable

Something like this should be returned.

/usr/local/foo.sh
/usr/local/bin/bar.pl

The ! character can be used to return non-executable files.

find /usr/local -type f ! -executable