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By piccoloprincipe
via blog.sanctum.geek.nz
Submitted: Nov 03 2013 / 11:48

In Bash scripting (and shell scripting in general), we often want to check the exit value of a command to decide an action to take after it completes, likely for the purpose of error handling. For example, to determine whether a particular regular expression regex was present somewhere in a file options, we might apply grep(1) with its POSIX -q option to suppress output and just use the exit value.
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