Turing Labs have some good tutorials on system administration, but what stuck out for me were some excellent presentation slides for regular expressions and perl. These would be great for someone who wants to do quick refresh of something they already know, but it would be even better for putting together a quick lunch-time learning presentation but didn't want to invest the time (or more realistically, doesn't have the time to invest).
- Regular Expressions (August 14th, 2004)
- Introduction to Perl (July 30th, 2005)

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