Mostly on the command line (via a shell). Call me old-fashioned, but that's the easiest way for me to process stuff. Don't get me wrong, i too create GUI's that use CGI (well ... mod_perl) and a browser ... that's a beautiful gift from the internet: a "universal app server". But i must say that creating a front end via the web to some Perl scripts seems a bit overkill, especially when you already have one - the command line. If you haven't already bought it, go get a copy of Data Munging With Perl. In it, davorg details how to set up 'pipelines' for command line scripts. Very useful stuff!

And remember, even though you may not be dealing directly with a shell, the webserver is. In essense, by creating web front ends to Perl scripts, you are creating a bypass right back to where you started. This may make sense for a group of users who do not have direct access to the tools on a computer, but for a single coder who already had the access, it can only be best used as an educational tool for that single coder. And there's nothing wrong with that. ;)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)