>     insserv -v

> > #! /bin/sh
> > ### BEGIN INIT INFO
> > # Provides:          firewall
> > # Required-Start:
> > # Required-Stop:
> > # Should-Start:
> > # Should-Stop:
> > # Default-Start:     2 3 4 5
> > # Default-Stop:
> > # Short-Description: Initialize firewall
> > # Description:       Start nft firewall settings for desktop
> > #                    Applies to first wifi device
> > ### END INIT INFO

> > do_start () {
> >     #WLAN=`cat /proc/net/wireless | perl -ne '/(\w+):/ && print $1'`
> >     # above isn't available until wifi device is associated
> >     WLAN=`iwconfig | perl -ne '/(wlan\d)/ and print $1'`
> >     export WLAN
> >     log_action_msg "Starting firewall on wifi device $WLAN"
> >     perl -pe 's/WLAN/$ENV{WLAN}/' /etc/nft-firewall > /etc/nft-firewall-
> wifi
> >     nft -f /etc/nft-firewall-wifi
> > }

> > case "$1" in
> >   start)
> >     do_start
> >     ;;
> >   stop)
> >     log_action_msg "Stopping firewall"
> >     nft flush ruleset
> >     ;;
> >   status)
> >     log_action_msg "Showing firewall ruleset"
> >     log_action_msg "# start ruleset"
> >     nft list ruleset
> >     log_action_msg "# end ruleset"
> >     ;;
> >   *)
> >     echo "Usage: $0 start|stop|status" >&2
> >     exit 3
> >     ;;
> > esac