May 2005
Intermediate to advanced
560 pages
15h 18m
English
Content preview from Classic Shell ScriptingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Summary
In this chapter, we have written two useful tools that do not already exist on Unix systems, using shell statements and existing standard tools to carry out the task. Neither of them is particularly time-consuming to run, so there is little temptation to rewrite them in a programming language like C or C++. As shell scripts, they can be run without change on almost any modern Unix platform.
Both programs support command-line options, cleanly processed by while and case statements. Both use shell functions to simplify processing and prevent unnecessary code duplication. Both pay attention to security issues and perform sanity checks on their arguments and variables.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.