Web Reference: In shell scripting, built-in variables are predefined variables that are available to the shell and can be used in scripts without having to be set or exported first. Mar 7, 2026 · Built-in shell variables are predefined variables that are automatically created and managed by the shell to provide information about the system, shell environment, and script execution state. Learn about user-defined variables in shell scripting, their rules, and how to define and use them with practical examples.
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