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8 Linux shell tricks that completely change how commands work

The shell does far more than run commands. Here’s how Bash expands your input behind the scenes so you can write cleaner, ...
Ars Technica

Shell scripting question: the use of variables

Hi there,<br><br>I have seeing some shell script examples that use (use, not declare!) variables like this:<br><br><pre class="ip-ubbcode-code-pre">${VAR_1}</pre> <br ...