[BOOK|PDF] Linux Shell Scripting with Bash

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Otherwise, it is set to the file name used to invoke bash, as given by argument zero. If so, that word is replaced by the text of the alias. The element with index n is the portion of the string matching the nth parenthesized subexpression.

Brace expansion is performed before any other expansions, and any characters special to other expansions are preserved in the result. If a prefix matches more than one job, bash reports an error. For this we can use the built-in!

Writing a Simple Bash Script - Shell scripting is the art of creating and maintaining such scripts.