Mine

PATH=/sbin:/bin

. /lib/init/vars.sh
. /lib/lsb/init-functions

do_start () {
        [ -f /etc/hostname ] && HOSTNAME="$(cat /etc/hostname)"

        # Keep current name if /etc/hostname is missing.
        [ -z "$HOSTNAME" ] && HOSTNAME="$(hostname)"

        # And set it to 'localhost' if no setting was found
        [ -z "$HOSTNAME" ] && HOSTNAME=localhost

        [ "$VERBOSE" != no ] && log_action_begin_msg "Setting hostname to '$HOSTNAME'"
        hostname "$HOSTNAME"
        ES=$?
        [ "$VERBOSE" != no ] && log_action_end_msg $ES
}

case "$1" in
  start|"")
        do_start
        ;;
  restart|reload|force-reload)
        echo "Error: argument '$1' not supported" >&2
        exit 3
        ;;
  stop)
        # No-op
        ;;
  *)
        echo "Usage: hostname.sh [start|stop]" >&2
        exit 3
        ;;
esac