Sample template for me when making bash scripts

alpha2x.sh

#!/bin/bash

## THIS SOFTWARE IS FREE SOFTWARE LICENSED UNDER THE GNU GPL V3

## CONFIGURATION
export A2PRG_VER=0
export A2PRG_SCRPT=Sample

# COLOR SETUP
RED='\033[0;31m'
NC='\033[0m'
LG='\033[0;37m'
PA='\033[0;36m'
YEL='\033[1;33m'
GRE='\033[1;32m'
PUR='\033[1;35m'

# INIT
echo "You ran $A2PRG_SCRIPT Version $A2PRG_VER : Executable name $0"
echo "Target ? - t"

case "$0" in
     *\ * )
           echo -e "${RED}✗ ERROR: File name contains spaces. Rename and try again.${NC}"
           exit
          ;;
       *)
           echo -e "${GRE}✓ OK: Problem detection mechanism passed!"
           ;;
esac