Titlebook: Expert Shell Scripting; Ron Peters Book 2009 Ron Peters 2009 Debugging.Linux.OS X.Processing.RCS.configuration.shell scripting.system admi

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Comparisons and Testsriables, strings, and numeric values, and to take action based on the result. You can also carry out actions based on the attributes of a particular item, such as a file’s type, whether a variable has been assigned a value, and the return code of a command.

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Shell Process Treeis an implementation of this functionality on some versions of Solaris (ptree) and on all flavors of Linux (pstree). These have proved very valuable to me for finding the root of a process group quickly, especially when that part of the process tree needs to be shut down.