Listing 1: NS shell script

#!/bin/sh

if [ "$#" -eq 0 ]
then
echo
echo the syntax of the NS command is:
echo
echo "  NS debug ON debugging-level - set the debugging level"
echo "  NS debug OFF                - turn off debugging"
echo ""
echo "  NS dump                     - dump the database"
echo "  NS reload                   - reload the database"
exit
fi

count=$#
arg1=$1
arg2=$2
arg3=$3

case "$1"
in

debug ) echo setting the debug
case "$2"
in
on ) echo set debbugging on at $3
if [ "$arg3" -eq "" ]
then
count=1
else
count=$arg3
fi

echo increasing the debug level by $count
while [ "$count" -gt 0 ]
do
kill -USR1 `cat /etc/named.pid`
count=`expr $count - 1`
done

;;
off ) echo set debugging off
kill -USR2 `cat /etc/named.pid`
;;
esac
;;

dump )  echo Dumping the database, see /usr/tmp/named_dump.db
kill -INT `cat /etc/named.pid`
;;

reload ) echo Reloading the database......
kill -HUP `cat /etc/named.pid`
;;

esac