Does the simple job of finding any 'source' lines in a BASH script and replacing that line with the full contents of that source.

So you can split your BASH script up into multiple files and then 'compile' it into a single file when you're ready.

> ls
standalone.sh
program.src.sh
include_file.sh

#!/bin/bash

echo "start"

source include_file.sh

echo "finish"

#!/bin/bash

echo "middle"

./standalone.sh --input program.src.sh --output program.sh

The program.sh will be generated with the same permissions as the source.

#!/bin/bash

echo "start"

#source include_file.sh
echo "middle"

echo "finish"