bash-scripting/function-return.sh at master · erdavila/bash-scripting · GitHub

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#!/bin/bash
set -e

# Duplicate the original stdout fd so that the function can use it
exec {STDOUT}>&1


function func() {
	# At this point, the function's stdout fd (1) is redirected to be captured by the function caller

	# Move the return fd (from 1 to $RETURN)
	exec {RETURN}>&1-

	# Restore the original stdout (duplicates $STDOUT to 1)
	exec 1>&$STDOUT

	echo 'This should go to standard output'
	echo 'This should go to error output' >&2
	echo 'This should be returned by the function' >&$RETURN

	# Close the return fd ($RETURN)
	#exec {RETURN}>&-  # Not really needed!
}

function func-simple() {
	echo 'This should go to standard output [simple]'
	echo 'This should go to error output [simple]' >&2
	echo 'This should be returned by the function [simple]' >&$RETURN
} {RETURN}>&1- 1>&$STDOUT

echo "The function returns \"$(func)\""
echo "The function returns \"$(func-simple)\""


# Close the duplication ($STDOUT) of the original stdout fd
exec {STDOUT}>&-