#!/bin/sh

usage()
{
    echo "usage: ps2pbm [-r resolution] [psfile]" >&2
    exit 1
}

while getopts ":r:" c
do
    case "$c" in
    r)     res="-r$OPTARG";;
    :|'?') usage;;
    esac
done
shift $(($OPTIND - 1))
psfile=-_; if [ $# -gt 0 ]; then psfile=$1; fi
gs -dBATCH -dNOPAUSE -sDEVICE=pbmraw $res -sOutputFile=- -q "$psfile"
.