Define a function

bash

greet() { echo "Hello, $1"; }

Explanation

Bash supports both name() { ... } and function name { ... } forms.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

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Invoke a shell function with arguments.

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Keep function internals from leaking into caller scope.

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Return a status code from a function.

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Emit data to stdout and capture it with command substitution.

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Trace function execution during debugging.

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Check whether a regular file exists.