File pppoe-status of Package rp-pppoe

#!/bin/sh

for i in /run/ppp/??*.pid ; do
	if [ -r "$i" ] && [ `wc -l < "$i"` -eq 2 ] ; then
		PID=`head -n 1 "$i"`
		IF=`sed -n '2p' "$i"`
		if [ -z "$PID" ] || [ -z "$IF" ] || ! ps -p "$PID" &>/dev/null; then
			echo "pppoe-status: Process $PID for interface $IF does not exist"
			continue
		fi
		if ! ip route | grep -qw "dev $IF"; then
			echo "pppoe-status: Link is attached to $IF, but $IF is down"
			exit 1
		fi
		echo "pppoe-status: Link is up and running on interface $IF"
		ip addr show "$IF"
		exit 0
	fi
done

echo "ppppoe-status: Link is down"
exit 1