Question

How can I list all available UNIX commands from Perl?

Answer 1

perl -MFile::Find -le 'find sub {print if -f and -x _}, split ":", $ENV{PATH}'

This code looks in each directory in your path (split ":", $ENV{PATH}) for files (-f) that are executable (-x), and prints the ones it finds. You may want to read about

• File::Find
• split
• %ENV
• filetest operators

An alternative that does not search subdirectories of the directories in the PATH is

perl -le '-f and -x _ and print for map { glob "$_/*" } split ":", $ENV{PATH}'