I figure this is an easier way to post this to the net. This article, which is a tutorial on bash scripting (a UNIX shell) was written for the Happy Hacker mailing list as one of the Guides to (mostly) Harmless Hacking.
It never made it into Carolyn Meinel’s Happy Hacker book — because my mailexcite address died when Excite were bought out, and then due to my slackness a few years later for not writing Carolyn an official letter allowing her to publish it.
Either way, I retain the copyright, so here it is in its original glory. It is (c) 1998-2005 Spiro Harvey.
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