I often take a dim view of books that use superlatives in their
titles. I also don't think there is anything "wicked cool" about
shell scripting in general: if you need anything complex at all,
Perl or something else is probably a much better way to to it.
Shell scripting gets awfully nasty awfully fast.
However, I was wrong. Yes, shell scripting is an abominable way
to approach most of the tasks this book explores. Just the same,
the author does it "wicked cool" and you can learn a lot both from
how he sees the problem and the other Unix tools he uses as part of
the script. So while you might shudder at the idea of writing a
link-checker in Bash, the author's clever use of Lynx's "traverse"
flag is something you might make use of elsewhere. You'll find
useful things like that throughout the book, and even if you'd
rather write it in Perl or whatever, the logic is worth
Mac OS X users will appreciate that a whole chapter is devoted
to that. There's nothing particularly deep there, nothing you will
be surprised by, but it's nice to see Mac get specific mention.
That brings up another important point: shells are different and
Unixes are different. The author does pay a lot of attention to the
differences that can cause problems for your scripts when they need
to run on different platforms.