Modem monitor

[clickit]

I created this script to monitor for ppp0 in ifconfig response. When I NOHUP 'd it (modmCk) in the script which starts ppp-go it worked well until the alarm went off. I could not KILL the modmCK. I ended up rebooting.
Can someone suggest how I can start modmCK from the one I am using to start ppp-go (Slackware) and be able to leave the startup script while leaving this script running AND be able to kill it?

while :
do
sleep $1s
ifconfig | egrep -q ppp0
if [ "$?" == "1" ]
then while :
do
play /opt/SECURE/KISMET/kismet-2010-01-R1/wav/gpslost.wav 2>/dev/null
sleep 2s
done
fi
done

[clickit]

There is a typo following sleep and before 1s which was the problem.
For antiquated dialup users this may help:

########################################################################
# mdmCkr.sh   Will alert user when modem linkage fails by sounding
#             4 warning bells 4 times.  
#             If run: nohup ./mdmCkr.sh & 
#             The nohup.out file is deleted then this script is killed.
########################################################################

echo -e "Modem Checker Active (Job: $$)"
knt=0
while :
do
   sleep 5s
# Look for point-to-point feature (ppp0)
   /sbin/ifconfig | egrep -q ppp0
   if [ "$?" == "1" ]
   then for i in 1 2 3 4
        do
# Play warning 4 bells if pt-2-pt is lost
           play /opt/SECURE/KISMET/kismet-2010-01-R1/wav/gpslost.wav \
                2>/dev/null
           sleep 2s          # Bell separation time
        done
# Display job number with each warning
        echo -e "Modem Link Failed (Job: $$)"
        knt=`expr $knt + 1`
   fi

# After 4 warnings (16 bells) quit
   if [ $knt -gt 3 ]
   then rm -f nohup.out      # Remove nohup.out if run from background
        kill $$              # Kills itself if run in background
        exit
   fi
done