Shell Programming and Scripting

AppInstance=(xxx,aaa,ddd,ccc,xxx,cccfg)

AppInstance=(xxx aaa ddd ccc xxx cccfg)

echo "App Instance $i is not running . $(hostname) as on $(date)" >> $logFile

logFile=~/AppInstance_status.txt 
while read i ; do  #loop through the file
   AppInstance_status=`ps -ef | grep $i | grep -v grep`
   if [ -z "$AppInstance_status" ] ;  then
     echo "App Instance $i is not running . $(hostname) as on $(date)"  >> $logFile
   fi
done < AppInstances.lst

cat $logFile | mail -s "Alert: AppInstance status check on Production " email_address

xxx
aaa
ddd
ccc
xxx
cccfg

SummaryHandler_status='ps -ef | grep -c SummaryHandler'
  if [ -z "$SummaryHandler_status -ne 2" ];
  then 
    echo "There should be 2 instances of SummaryHandler app running but only 1 has been detected. 
             Please take necessary action to start the missing instance. $(hostname) as on $(date)" |
mail -s "Alert: SummaryHandler is not running" email@address
fi

SummaryHandler_status=`ps -ef | grep -c SummaryHandler`

SummaryHandler_status=$(ps -ef | grep -c SummaryHandler)

SummaryHandler_status='ps -ef | grep -c SummaryHandler'
echo quotes: $SummaryHandler_status
SummaryHandler_status=`ps -ef | grep -c SummaryHandler`
echo backticks: $SummaryHandler_status

if [ $SummaryHandler_status -eq 2 ] ; then ...

if [ -z "$SummaryHandler_status" ] ; then

if [ -z "$SummaryHandler_status -ne 2" ] ; then

SummaryHandler
Validator
VEEIntervalMonitorMessageProcessorApp
...

while read app ; do 
  status=`ps -ef | grep -c $app`
  if [ $status -ne 3 ] ; then 
    echo "There should be 2 instances of $app app running but $(($status - 1)) has been detected. 
              Please take necessary action to start the missing instance. $(hostname) as on $(date)" |
    mail -s "Alert: $app is not running" email@address
  fi   
done < Apps.txt

SummaryHandler 2 
Validator 2
RTFFramer 3
...

while read app cnt ; do 
  status=`ps -ef | grep -v grep | grep -c $app`
  if [ $status -ne $cnt ] ; then 
    echo "There should be $cnt instances of $app app running but $status has been detected. 
            Please take necessary action to start the missing instance. $(hostname) as on $(date)" |
    mail -s "Alert: $app is not running" email@address
  fi   
done < Apps.txt

#!/bin/sh

## check the number of running instances of apps against the expected counts
input=Apps.txt
log=AppsErr.log
: > $log   #truncate the file if exists

if [ ! -f $input ] ; then 
   echo "I need file $input to read the apps names and expected counts from"
   exit 1
fi

while read app cnt ; do 
  status=`ps -ef | grep -v grep | grep -c $app`
  if [ $status -ne $cnt ] ; then 
    echo "There should be $cnt instances of $app app running but $status has been detected. 
             Please take necessary action to start the missing instance. $(hostname) as on $(date)" >> $log
    sendDaMail=1  #flag that error in counts has been noticed
  fi   
done < $input

if [ _$sendDaMail = _1 ] ; then  #send mail only if error was found
  mail -s "Alert: some Apps not running in correct count" email@address < $log
fi

chmod 754 checkApps.sh

./checkApps.sh