From LQWiki

wouldn't it be better to educate the reader to take a look at wikipedia regarding these non-open-source-related topics? --ThorstenStaerk 09:35, December 9, 2009 (UTC)

I agree that non-open-source-related topics are generally off-topic here at the LinuxQuestions wiki. But this article discusses Perl, Python, tcl, bash, and sh. They are all open-source, right? --DavidCary 19:16, December 9, 2009 (UTC)