Bash

Functions Commands

Create reusable functions in Bash. Learn function syntax, parameters, and return values for modular scripts.

8 commands

Pro Tips

Use 'local' keyword to declare local variables inside functions.

Functions access arguments via $1, $2, etc. Use $@ for all arguments.

Commands

Define function

$ function name() { echo "Hello"; }

Define a function.

Function shorthand

$ name() { echo "Hello"; }

Define function without keyword.

Function with args

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

Function with positional arguments.

Local variable

$ func() { local var="value"; echo $var; }

Declare local variable in function.

Return value

$ func() { return 0; }

Return exit status from function.

Capture function output

$ result=$(function_name arg1 arg2)

Capture function output to variable.

All function args

$ func() { for arg in "$@"; do echo "$arg"; done; }

Iterate over all function arguments.

Check function exists

$ declare -f function_name > /dev/null && function_name

Call function only if it exists.