Functions | skybert.net

Functions


Making Functions Return Values

The clue is to let the function run in its own sub process and let the value beecho-ed instead of return-ed as you'd do in most other programming languages.

function get_number()
{
  echo 12;
}

echo "The number is" $(get_number)

Lambda functions in BASH

A great feature I love in Lisp, is lambda functions, a function which is applied to e.g. the values inside a loop. Doing this in BASH is so easy. I've created a simple (and yes, silly) example to illustrate this:

for el in black sabbath rocks; do
  double_length=$(
    # whatever is echo-ed here, is the return value of the lambda function.
    echo $(( $(echo $el | wc -c) * 2 ))
  )

  echo "The dobule length of $el is $double_length"
done

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