#!/bin/sh mtd= usage="$0 [OPTIONS]\n -m <mtd>" while getopt "m:h" opt; do if [ ${opt} = m ]; then mtd=${OPTARG} elif [ ${opt} = h ]; then echo -e "$usage" exit 0 fi done if [ -z "$mtd" ]; then echo -e "$usage" exit 1 fi global.linux.bootargs.root="root=$mtd rootfstype=jffs2"