argument_parsing_in_bash.sh

#!/bin/bash
# https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash/29754866

POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"

# set default values
DEFAULT=NO

case $key in
    -d|--default)
    DEFAULT=YES
    shift # past argument
    ;;
    -e|--extension)
    EXTENSION="$2"
    shift # past argument
    shift # past value
    ;;
    -s|--searchpath)
    SEARCHPATH="$2"
    shift # past argument
    shift # past value
    ;;
    *)    # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters