#!/bin/bash
# created by mambang

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
APP="/etc/init.d/apache2" # change this
NAME="apache2" #change this
APPOPTION="start"  # optional
PGREP="/usr/bin/pgrep"  # depends on pgrep for checking pid
DATE=`date +"%d-%m-%Y"`  #optional for logging


function start(){
$PGREP ${NAME} > /dev/null
if [ $? -ne 0 ]
then
       echo "$DATE : Pid $NAME tiada. $NAME dimulakan..."
       exec $APP $APPOPTION | tido
else
       echo "$DATE : $NAME sedang run ...."
       tido
fi
}

function tido(){
sleep 20s #change this to 60s if you want to check every 60 seconds
start
}

start >> /var/log/checkpid &
exit

# tail -f /var/log/checkpid
23-08-2008 : Pid apache2 tiada. apache2 dimulakan...
23-08-2008 : apache2 sedang run ....

#!/bin/bash
# created by mambang

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
APP="/etc/init.d/apache2" #change
NAME="apache2" #change to the name of pid
APPOPTION="start"  #needed only if using startup script in /etc/init.d
APP2="/etc/init.d/dhcp3-server" #change
NAME2="dhcpd3" #name of pid
APPOPTION2="start"  #needed only if using startup script in /etc/init.d
PGREP="/usr/bin/pgrep"  #needed to check pid. Makesure you install.


function check1(){
$PGREP ${NAME} > /dev/null
if [ $? -ne 0 ]
then
DATE=`date +"%d-%m-%Y+%r"`
echo "$DATE : Pid $NAME tiada. $NAME dimulakan..."   #for logging
$APP $APPOPTION >/dev/null
echo
check2
else
DATE=`date +"%d-%m-%Y+%r"`
       echo "$DATE : $NAME sedang run ...."  # for logging. Comment if you don't need it
echo
check2
fi
}

function check2(){
$PGREP ${NAME2} >/dev/null
if [ $? -ne 0 ]
then
DATE=`date +"%d-%m-%Y+%r"`
       echo "$DATE : Pid $NAME2 tiada. $NAME2 dimulakan..." #for loging
$APP2 $APPOPTION2 > /dev/null
echo
tido
else
DATE=`date +"%d-%m-%Y+%r"`
echo "$DATE : $NAME2 sedang run ...."  # for logging. Comment if you don't need it
echo
tido
fi
}

function tido(){
sleep 20s
check1
}

check1 >> /var/log/checkpid &   # start and logging

exit

#!/bin/sh
#
# daemon cron script can be use with anything program that have a pid files
# zuan(at)mylinux.net.my|daemon.cron|200810729|2343
#

daemon_dir="/path/to/your/program"
daemon_exec="program"
daemon_pid="/path/to/your/program.pid"

#### don't touch below here ####

cd $daemon_dir

# make sure filesystem isn't full
freespace=`df -k . | tail -1 | awk {'print $4'}`
if [ $freespace -lt 10 ]; then
       echo "Filesystem Full!"
       exit
fi

# see if stale pid file
if [ -f $daemon_pid ]; then
  pid=`cat $daemon_pid`
     if [ `ps -p $pid | wc -l` -eq 2 ]; then
            exit
        else
        echo "Stale PID File"
   fi
fi

echo "Starting Your Deamon Process..."
$daemon_exec