simple bash template that handles mandatory and optional arguments

myscript

#!/bin/bash
script="myscript"
#Declare the number of mandatory args
margs=2

# Common functions - BEGIN
function example {
    echo -e "example: $script -m0 VAL -m1 VAL -o1 -o2 VAL"
}

function usage {
    echo -e "usage: $script MANDATORY [OPTION]\n"
}

function help {
  usage
    echo -e "MANDATORY:"
    echo -e "  -m0, --mandatory0  VAL  The desc of the mandatory0 parameter"
    echo -e "  -m1, --mandatory1  VAL  The desc of the mandatory1 parameter\n"
    echo -e "OPTION:"
    echo -e "  -o0, --optional1        The desc of the optional0 boolean parameter"
    echo -e "  -o1, --optional2   VAL  The desc of the optional1 String  parameter"
    echo -e "  -h,  --help             Prints this help\n"
  example
}

# Ensures that the number of passed args are at least equals
# to the declared number of mandatory args.
# It also handles the special case of the -h or --help arg.
function margs_precheck {
	if [ $2 ] && [ $1 -lt $margs ]; then
		if [ $2 == "--help" ] || [ $2 == "-h" ]; then
			help
			exit
		else
	    	usage
			example
	    	exit 1 # error
		fi
	fi
}

# Ensures that all the mandatory args are not empty
function margs_check {
	if [ $# -lt $margs ]; then
	    usage
	  	example
	    exit 1 # error
	fi
}
# Common functions - END

# Custom functions - BEGIN
# Put here your custom functions
# Custom functions - END

# Main
margs_precheck $# $1

marg0=
marg1=
oarg0="false"
oarg1="default"

# Args while-loop
while [ "$1" != "" ];
do
   case $1 in
   -m0  | --mandatory0 )  shift
                          marg0=$1
                		  ;;
   -m1  | --mandatory1 )  shift
   						  marg1=$1
			              ;;
   -o0  | --optional0  )  oarg0="true"
                          ;;
   -o1  | --optional1  )  shift
                          oarg1=$1
                          ;;
   -h   | --help )        help
                          exit
                          ;;
   *)                     
                          echo "$script: illegal option $1"
                          usage
						  example
						  exit 1 # error
                          ;;
    esac
    shift
done

# Pass here your mandatory args for check
margs_check $marg0 $marg1

# Your stuff goes here