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POPSAdvanced Bash-Scripting Guide Perhaps the best-written, most readable guide to advanced shell scripting on the web. Copious hyperlinks, examples, and guru-level knowledge sprinkled throughout. This tutorial assumes no previous knowledge of scripting or programming, but progresses rapidly toward an intermediate/advanced level of instruction . . . all the while sneaking in little snippets of UNIX® wisdom and lore . It serves as a textbook, a manual for self-study, and a reference and source of knowledge on shell scripting techniques. The exercises and heavily-commented examples invite active reader participation, under the premise that the only way to really learn scripting is to write scripts .