Shell Programming and Scripting

fallowing code is for init script for dnotify service
# !/bin/bash
# DESCRIPTION
#Process name-dnotify
# Dnotify startup script:-
# Init/rc scripts are bash scripts used to manage services like dnotify.
# Dnotify (directory notification) is a utility for monitoring filesystem events i.e.
# Dnotify is a file system event monitor for the Linux kernel,
# A init script for dnotify provides feature for starting , stopping , getting status
# and restarting a service.


# Checkng that we are root ... so non-root users stop here
[ `id -u` = 0 ] || exit 1

#flush filesystem buffer
sync

# check for Source function library.
if [ -f /etc/rc.d/init.d/functions ]
then
. /etc/rc.d/init.d/functions
else
echo "$0: source function library doen't exit?.."
exit 1
fi

sync

#variable declaration
PATH_TO_DNOTIFY=/usr/bin/dnotify
PBS_JOBS_DIR=/usr/spool/PBS/server_priv/jobs/
COPY_COMMAND=/usr/local/bin/copyFile.sh
DIR_CP=/usr/spool/PBS/reports
PID_FILE=/var/run/dnotify.pid
LOCK_FILE=/var/lock/subsys/dnotifyd
RETVAL=0

#check for dnotify service file
# [ -x $PATH_TO_DNOTIFY ] || exit 0
if [ ! -x $PATH_TO_DNOTIFY ]
then
echo "$0:dnotify service is not present?.."
exit 1
fi

#check for PBS_JOBS_DIR directory
if [ ! -d $PBS_JOBS_DIR ]
then
echo "$0:directory to be monitored is not present?.."
exit 1
fi

#check for copy command script file
if [ ! -x $COPY_COMMAND ]
then
echo "$0:copy command script file is not present?.."
exit 1
fi


# check whether dnotify service is already started;if it is,then throw error otherwise start the service
start() {
if [ -f $LOCK_FILE -a -f $PID_FILE ]
then
echo -e "Error:dnotify is already running......"
exit 0
else
echo -e $"Starting dnotify......."
sync
#run dnotify service with create event i.e. -C directory to be monitored i.e.PBS_JOBS_DIR and execute copy command i .e. -e $COPY_COMMAND

$PATH_TO_DNOTIFY -C $PBS_JOBS_DIR -e $COPY_COMMAND &

RETVAL=$?
# creating lock file
[ $RETVAL -eq 0 ] && touch $LOCK_FILE

#add date to lock file
date > $LOCK_FILE
#add pid of dnotify to pid file
pidof dnotify > $PID_FILE
RETVAL=$?

sync

#creating test file in PBS_JOBS_DIR
[ $RETVAL -eq 0 ] && touch $PBS_JOBS_DIR/test_file11
RETVAL=$?

#taking timestamp and filename
if [ -e $PBS_JOBS_DIR/test_file11 ]
then
[ $RETVAL -eq 0 ] && q=`ls -l $PBS_JOBS_DIR/test_file11 |cut -d' ' -f7,8,9`
RETVAl=$?
[ $RETVAL -eq 0 ] && q1=`ls -l $DIR_CP/test_file11 |cut -d' ' -f7,8,9`
RETVAl=$?
fi

#comparing strings to verify whether service is functional or not
if [ "$q" = "$q1" ]
then
echo -e "dnotify service is started and is functional..."
else
echo -e "dnotify service is not functional..."
fi

#removing test file
[ -e $PBS_JOBS_DIR/test_file11 ] && rm -f $PBS_JOBS_DIR/test_file11
[ -e $DIR_CP/test_file11 ] && rm -f $DIR_CP/test_file11
sync
fi
return $RETVAL
}


#option for stopping dnotify
stop() {
#checking for lockfile nad pid file
if [ -f $LOCK_FILE -a -f $PID_FILE ]
then
echo -e "Stopping dnotify......"

#killing process i.e.stopping service
cat $PID_FILE | xargs kill -9

#stopping other dnotify process instances running
ps -aef | grep dnotify | awk '/dnotify/ {kill -9 $2}'

RETVAL=$?

#removing lockfile
[ $RETVAL -eq 0 ] && rm -f $LOCK_FILE

#removing pidfile
rm -f $PID_FILE

echo -e "dnotify service is stopped. "

return $RETVAL
else
echo -e "dnotify service is alredy stopped....."
fi
}

#option for knowing status
status () {
if [ -f $LOCK_FILE -a -f $PID_FILE ]
then
echo -e "STATUS : dnotify is running......"
echo -e "Date and time when dnotify service is started is : "
#displaying service information
cat $LOCK_FILE
echo -en "Pid of dnotify is : "
cat $PID_FILE
else
echo -e "STATUS : dnotify is not running...."
fi
exit 0
}

#Handling arguments
case "$1" in
start)#call to start function
start
;;
stop)#call to stop function
stop
;;

restart)#first call to start function and then to stop function
echo "restarting dnotify..."
stop
start
;;

status)#call to status function
status
;;

condrestart)
#This option call stop and start, but only if the service is currently running
if [ -f $LOCK_FILE ]
then
stop
start
else
echo "ERROR:check that service is running...."
fi
exit 0
;;
*)#invalid arguments passed will see this
echo $"Usage: $0 {start|stop|status|restart|condrestart}"
exit 1
esac

now i am getting error like this when i execute script with start option
Starting dnotify.......
ls: /usr/spool/PBS/reports/test_file11: No such file or directory
dnotify service is not functional...
[root@tb0 ~]# cp: cannot stat `/usr/spool/PBS/server_priv/jobs/test_file11': No such file or directory
/usr/bin/dnotify: child terminated with non-zero status
help asap