use ##short option in bash ##

use_short_option.sh

#!/bin/bash
help()
{
    cat <<  HERE
    usage: ./opt.sh -a {value} -b {value} -c {value} -d {value} -h
HERE
}

while getopts "a:b:c:d:h" arg
do
    case $arg in
    a)
    echo "option a is $OPTARG"
    ;;
    b)
    echo "option b is $OPTARG"
    ;;
    c)
    echo "option c is $OPTARG"
    ;;
    d)
    echo "option d is $OPTARG"
    ;;
    h)
    help
    exit 0
    ;;
    ?)
    help
    exit 1
    ;;
    esac
done