Chris F. A. Johnson is a regular and important contributor to comp.os.linix.misc, comp.unix.shell and other newsgroups. This book is a wonderful compilation of shell scripting functions and recipes, from the basic to amazingly complex and powerful. It's focus is Posix, though pdksh and bash should work for these.
I was surprised by the tasks Chris tackles here. Chris writes shell scripts where I would automatically use Perl because of the complexity. He has scripts for crossword puzzles, for website scraping and many other unexpected tasks.
Of course the more prosaic tasks are covered here also. String functions, databases, dates, editing - I don't think Chris missed much.
Excellent book, highly recommended.
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