At a basic level, parameter expansion means changing Bash syntax into a value—expanding it. For example: echo "$foo" This simple variable turns into its assigned value. However, ...

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See also https://gist.github.com/mlocati/fdabcaeb8071d5c75a2d51712db24011 for a few more like bold, underline, ... Count the number of arguments passed to the script ...

This script should be safe to run since it can revert everything it changed, however still use it at your own risk Simple Batch that does optimizations like disabling Tasks, Services and much more ...