note eyepopslikeamosquito Very nice. This tutorial covers some of the things I plan on covering when I finally get around to writing a tutorial based on [id://418891]. Update: I just noticed [id://158999] and [id://102347] both of which look excellent. In addition to strict and warnings, don't forget taint mode testing. Re coding style, Abigail's [id://215675] is worth a read. It's vital to choose a good interface first time. Once your module is released into the wild it may become practically impossible to change its interface; anything else can be fixed later. Two good nodes I've noticed re creating good interfaces are [id://338941] and [id://317520]. Any other good ones, please let me know. Update: I couldn't find any more, so I wrote one: [id://553487]. Update: I expect [TheDamian]'s upcoming book "Perl Best Practices" will have some sound advice on this subject. 431702 431702