parse /proc/cmdline from ubunut livecd

# Parse command line options
for x in $(cat /proc/cmdline); do
        case $x in
        init=*)
                init=${x#init=}
                ;;
        root=*)
                ROOT=${x#root=}
                case $ROOT in
                LABEL=*)
                        ROOT="/dev/disk/by-label/${ROOT#LABEL=}"
                        ;;
                UUID=*)
                        ROOT="/dev/disk/by-uuid/${ROOT#UUID=}"
                        ;;
                /dev/nfs)
                        [ -z "${BOOT}" ] && BOOT=nfs
                        ;;
                esac
                ;;
        rootflags=*)
                ROOTFLAGS="-o ${x#rootflags=}"
                ;;
        rootfstype=*)
                ROOTFSTYPE="${x#rootfstype=}"
                ;;
        rootdelay=*)
                ROOTDELAY="${x#rootdelay=}"
                case ${ROOTDELAY} in
                *[![:digit:].]*)
                        ROOTDELAY=
                        ;;
                esac
                ;;
        resumedelay=*)
               RESUMEDELAY="${x#resumedelay=}"
                ;;
        loop=*)
                LOOP="${x#loop=}"
                ;;
        loopflags=*)
                LOOPFLAGS="-o ${x#loopflags=}"
                ;;
        loopfstype=*)
                LOOPFSTYPE="${x#loopfstype=}"
                ;;
        cryptopts=*)
                cryptopts="${x#cryptopts=}"
                ;;
        nfsroot=*)
                NFSROOT="${x#nfsroot=}"
                ;;
        netboot=*)
                NETBOOT="${x#netboot=}"
                ;;
        ip=*)
                IPOPTS="${x#ip=}"
                ;;
        boot=*)
                BOOT=${x#boot=}
                ;;
        resume=*)
                RESUME="${x#resume=}"
                ;;
        resume_offset=*)
                resume_offset="${x#resume_offset=}"
                ;;
        noresume)
                noresume=y
                ;;
        panic=*)
                panic="${x#panic=}"
                case ${panic} in
                *[![:digit:].]*)
                        panic=
                        ;;
                esac
                ;;
        quiet)
                quiet=y
                ;;
        ro)
                readonly=y
                ;;
        rw)
                readonly=n
                ;;
        debug)
                debug=y
                quiet=n
                exec >/tmp/initramfs.debug 2>&1
                set -x
                ;;
        debug=*)
                debug=y
                quiet=n
                set -x
                ;;
        break=*)
                break=${x#break=}
                ;;
        break)
                break=premount
                ;;
      blacklist=*)
                blacklist=${x#blacklist=}
                ;;
        esac
done