The best method to use is, at the top of the scripts, write "#!/usr/bin/perl", which tells a terminal to execute this script using perl.
Next, you should open Terminal.app, which is in /Applications/Utilities.
Type "cd location-of-perl-script".
Then type "chmod a+x perl-script-filename" to make it executable.
lastly, to run the script, either type "perl perl-script-filename" or "./perl-script-filename", the latter if you added "#!/usr/bin/perl" to the top of the script. this is done of course in the Terminal.app, and in the directory of which the script is located.