UsiScript - Your script in preview mode

#!/bin/bash
# ------------------------------------------------------------------
## Source = https://github.com/RenatGilmanov/shell-script-template/blob/master/getopts/template-getopts.sh
## Original author = RenatGilmanov
##
## Description
## This template include an example of the getops loop
##
##
# [Author] Title
#          Description
# ------------------------------------------------------------------

SUBJECT=some-unique-id
VERSION=0.1.0
USAGE="Usage: command -hv -a arg"

# --- Option processing --------------------------------------------
if [ $# == 0 ] ; then
    echo $USAGE
    exit 1;
fi

while getopts ":vh" optname
do
  case "$optname" in
    "a") varARG1="$OPTARG"
      ;;
    "v")
      echo "Version $VERSION"
      exit 0;
      ;;
    "h")
      echo $USAGE
      exit 0;
      ;;
    "?")
      echo "Unknown option $OPTARG"
      exit 0;
      ;;
    ":")
      echo "No argument value for option $OPTARG"
      exit 0;
      ;;
    *)
      echo "Unknown error while processing options"
      exit 0;
      ;;
  esac
done

###################
# Check arguments
#If the argument is empty
if [ "$varARG1" = "" ]; then
	echo "No argument given"
	exit 1
	# Or ask for input
	#echo "Enter the value ="
	#read varARG1
fi

# -----------------------------------------------------------------
# Check / put a lock file
LOCK_FILE=/tmp/${SUBJECT}.lock

if [ -f "$LOCK_FILE" ]; then
echo "Script is already running"
exit
fi

# -----------------------------------------------------------------
trap "rm -f $LOCK_FILE" EXIT
touch $LOCK_FILE

# -----------------------------------------------------------------
#  SCRIPT LOGIC GOES HERE
# -----------------------------------------------------------------