Shell
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Why this exists A shell script is a saved list of commands, and almost every mistake beginners make comes from one place: how the shell treats text. Variables are expanded, then split on spaces, then matched against…
Shell Basics: Variables, Quoting and Command Substitution
Variables, the difference between single and double quotes, braces, default values, arithmetic and command substitution, plus the quoting rule that prevents most shell bugs: always quote your variables.
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