Ellie Quigley is really an excellent writer-the text is clear, the examples are well chosen- this is a thoroughly enjoyable book.
In addition to bash and tcsh, she also covers sed, grep and awk. Each example script is explained fully, and there are very few mistakes or even minor misleadings anywhere. In fact, the only odd thing I remember noticing was an explanation of set uid shell scripts, a feature that Bash apparently allows. The reason it's odd is that most Unix os's do NOT allow setuid shell scripts, but that rather important fact wasn't mentioned.
Still, this is an excellent book and highly recommended for learning shell programming/scripting.
Order (or just read more about) Linux Shells by Example from Amazon.com
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