gistfile1.sh

#!/bin/bash

while [ "$*" ]; do
  case $1 in
    -pre*)
      XXX_PRE_ARGS=( $XXX_PRE_ARGS "$2" )
    ;;
    -post*)
      XXX_POST_ARGS=( $XXX_POST_ARGS "$2" )
    ;;
  esac
  
  shift 2
done

echo $XXX_PRE_ARGS something $XXX_POST_ARGS