How to manage the expansion of empty or unset bash variables

Posted by linuxer on Oct 8, 2018 8:21 PM EDT; By Egidio Docile
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Variables expansion is one of the most common feature used in the shell: when a variable exists and is part of a command, it is "expanded", so that is substituted by its value. The expansion of empty variables, is one of those things, that if not well managed, could cause serious damage to a system.

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