shell/bash get arguments alternative to getopts

getargs.sh

#!/usr/bin/env bash

# gets arguments/options from input, using `--arg=value`, `--arg value`, or `-a value` format
# doesn't allow doubling up short args, e.g. `-ot`

positional=()
one=
two=

while [ "$#" -gt 0 ]; do
  echo "$1"
  case "$1" in

    -o|--one) one="$2"; shift 2;;
    --one=*) one="${1#*=}"; shift 1;;

    -t|--two) two="$2"; shift 2;;
    --two=*) two="${1#*=}"; shift 1;;	    
    
    --one|--two) echo "$1 requires an argument" >&2; exit 1;;

    -*) echo "unknown option: $1" >&2; exit 1;;
    *) positional+=("$1"); shift 1;;
  esac
done


# usage / get values in script

echo $one
echo $two
echo positional "${positional[@]}"