Shows an example of an external "img" script. Note the flags; --usage, --short and --long which are required. img will forward any calls to 'img testing' with the given arguments. It will also display formatted help for `img help testing`, `img testing -h` and `img testing --help`, and list the `testing` command in a section of `img help`.

gistfile1.sh

#!/usr/bin/env sh
# Needs to be on $PATH as "img-testing".

function usage {
  echo "testing [args]"
}

function short {
  echo "A script to test external img scripts."
}

function long {
  echo "  Testing is purely designed for testing img's external scripting
  capabilites. It has no other use or purpose.

  --hello          # Says hello before doing anything"
}

case "$1" in
  --usage ) usage
  exit
  ;;
  --short ) short
  exit
  ;;
  --long ) long
  exit
  ;;

  --hello ) echo "Hello!"
  ;;
esac

echo "Running"