Simple Function

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# Define a function greet
greet ()
    echo "Hello World!"

# Call the function greet

In running the script, we see our message

$ bash
Hello World!

Note that sourcing a file with functions makes them available in your current bash session.

$ source   # or, more portably, "."
$ greet
Hello World!

You can export a function in some shells, so that it is exposed to child processes.

bash -c 'greet'  # fails
export -f greet  # export function; note -f
bash -c 'greet'  # success

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