Do not repeat help messages for simple executable file

[uzxmx]

Below is an install script, which shows help using sed.

#!/usr/bin/env bash
# Usage: [sudo] [prefix=/usr/local] ./install
set -e

case "$1" in
'-h' | '--help' )
  sed -ne '/^#/!q;s/.\{1,2\}//;1d;p' < "$0"
  exit 0
  ;;
esac

Refactor all executables that show simple help messages.