getopts long options

getopts.sh

#!/bin/bash
  
optspec=":-:"

while getopts "${optspec}" optchar; do
    case "${optchar}" in
        -)
            case "${OPTARG}" in
                *)
                    value=${OPTARG#*=}
                    opt=${OPTARG%=$value}
                    echo "You passed --${opt} as a flag with the value ${value}"
                    ;;
            esac
        ;;
    esac
done