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Looping in the shell script with help of script timer.

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# 1  
Old 05-24-2012
Question Looping in the shell script with help of script timer.
Hello Experts-

We are facing some issues in the while loop script when we use the script time to decide whether to exist from the loop or continue.
Below is the script

HTML Code:
SrcExitLoop="FALSE"
Src_InitialStartTime=`date +%s`
Src_StartTime=`date +%s`
Src_NUM_ALERTS=0
TOTAL_ALERTS=`expr <SOME WAIT THRESHOLD.e.g.50> / <SOME ALERT SECONDS.e.g 10>`


while [[ ${SrcExitLoop} == "FALSE" ]]
do

"Some Oracle Query"

Src_CurrentTime=`date +%s`
Src_WaitTime=`expr ${Src_CurrentTime} - ${Src_StartTime}`
Src_TotalTime=`expr ${Src_CurrentTime} - ${Src_InitialStartTime}`

if [[ ${Src_WaitTime} -gt <SOME ALERT SECONDS.e.g 10> ]]
 then
  if [[ ${Src_TotalTime} -gt <SOME WAIT THRESHOLD.e.g.50> ]]
   then
    echo "Reached Max Seconds"
  else
   Src_NUM_ALERTS=`expr ${Src_NUM_ALERTS} + 1`
   TotalTimeFormat=`printf ""%dh:%dm:%ds"\n" $((${Src_TotalTime}/3600)) $((${Src_TotalTime}%3600/60)) $((${Src_TotalTime}%60))`
   AlertSecondsFormat=`printf ""%dh:%dm:%ds"\n" $((${alert_seconds}/3600)) $((${alert_seconds}%3600/60)) $((${alert_seconds}%60))`
   errorSubject="ALERT ${Src_NUM_ALERTS}/${TOTAL_ALERTS} :- Process continues"
   errorText="EMAIL BODY"
   echo "${errorText}" | mailx -s "${errorSubject}" ${EMAIL_LIST}
  Src_StartTime=`date +%s`
 fi
else
  sleep <SOME VALUE.e.g.5>
fi

if [[ ${Src_TotalTime} -gt <SOME WAIT THRESHOLD.e.g.50> ]]
  then
    Src_NUM_ALERTS_1=`expr ${Src_NUM_ALERTS} + 1 `
    TotalTimeFormat=`printf ""%dh:%dm:%ds"\n" $((${Src_TotalTime}/3600)) $((${Src_TotalTime}%3600/60)) $((${Src_TotalTime}%60))`
    AlertSecondsFormat=`printf ""%dh:%dm:%ds"\n" $((${alert_seconds}/3600)) $((${alert_seconds}%3600/60)) $((${alert_seconds}%60))`
    errorSubject="ALERT ${Src_NUM_ALERTS_1}/${TOTAL_ALERTS} :- Process STOPPED"
    errorText="EMAIL BODY"
    echo "${errorText}" | mailx -s "${errorSubject}" ${EMAIL_LIST}
    SrcExitLoop="TRUE"
    exit 0
fi
done
This script works fine most of the time. Since we are using unix start and end time to determine the wait time and total time, it some times doesn't give all the emails.Smilie
This happens because the return time from the oracle is more.Smilie

For example :-
if our sleep time is 5 seconds ,
alert time is 10 seconds,
total threshold is 50 seconds.
Ideally we should receive 5 email every 10 seconds. Subject will "ALETRT 1/5...5/5".
But some times oracle is taking more than 10 seconds to return the value. Now the Src_NUM_ALERTS variable skips the one value..so insteading of receving 5 emails we receive only 4 emails and last email is "ALERT 4/5".
It miss one iteration that is breaks at...
Code:
Src_NUM_ALERTS=`expr ${Src_NUM_ALERTS} + 1`

Is there any other way where in we can avoid this skip? Smilie Can we simply use counter?Smilie
How can we define in the script that alert us every pre defined seconds(e.g.10 seconds) and do iteration depending upon the total wait time divided by total alert time(e.g.50/10)?Smilie
The email won't be coming exactly after 10 seconds(in this case) but we should recevie 5 emails(for above parametrers).
Please help.


Thanks in advance!!
# 2  
Old 05-24-2012
You're never going to get it exactly 50.00000000000000 seconds long. Anything you do could throw it off just slightly. Make your threshold slightly higher than 50 if you want all the emails sent.

Also, you can put the query in the background before the loop, and wait for it after, so things don't wait for each other needlessly.

Code:
while condition
do
        query &

        ...

        wait
done

# 3  
Old 05-25-2012
I think the email part you should put in another script. Call it in background by passing variables as argument.

hope this should work -

Code:
SrcExitLoop="FALSE"
Src_InitialStartTime=`date +%s`
Src_StartTime=`date +%s`
Src_NUM_ALERTS=0
TOTAL_ALERTS=`expr <SOME WAIT THRESHOLD.e.g.50> / <SOME ALERT SECONDS.e.g 10>`


while [[ ${SrcExitLoop} == "FALSE" ]]
do

"Some Oracle Query"

Src_CurrentTime=`date +%s`
Src_WaitTime=`expr ${Src_CurrentTime} - ${Src_StartTime}`
Src_TotalTime=`expr ${Src_CurrentTime} - ${Src_InitialStartTime}`

if [[ ${Src_WaitTime} -gt <SOME ALERT SECONDS.e.g 10> ]]
 then
  if [[ ${Src_TotalTime} -gt <SOME WAIT THRESHOLD.e.g.50> ]]
   then
    echo "Reached Max Seconds"
  else
   Src_NUM_ALERTS=`expr ${Src_NUM_ALERTS} + 1`
   TotalTimeFormat=`printf ""%dh:%dm:%ds"\n" $((${Src_TotalTime}/3600)) $((${Src_TotalTime}%3600/60)) $((${Src_TotalTime}%60))`
   AlertSecondsFormat=`printf ""%dh:%dm:%ds"\n" $((${alert_seconds}/3600)) $((${alert_seconds}%3600/60)) $((${alert_seconds}%60))`
   errorSubject="ALERT ${Src_NUM_ALERTS}/${TOTAL_ALERTS} :- Process continues"
   errorText="EMAIL BODY"

   nohup sendAlertMail.ksh "$errorText" "$errorSubject" "$EMAIL_LIST" 2>&1 &

   #echo "${errorText}" | mailx -s "${errorSubject}" ${EMAIL_LIST}

  Src_StartTime=`date +%s`
 fi
else
  sleep <SOME VALUE.e.g.5>
fi

if [[ ${Src_TotalTime} -gt <SOME WAIT THRESHOLD.e.g.50> ]]
  then
    Src_NUM_ALERTS_1=`expr ${Src_NUM_ALERTS} + 1 `
    TotalTimeFormat=`printf ""%dh:%dm:%ds"\n" $((${Src_TotalTime}/3600)) $((${Src_TotalTime}%3600/60)) $((${Src_TotalTime}%60))`
    AlertSecondsFormat=`printf ""%dh:%dm:%ds"\n" $((${alert_seconds}/3600)) $((${alert_seconds}%3600/60)) $((${alert_seconds}%60))`
    errorSubject="ALERT ${Src_NUM_ALERTS_1}/${TOTAL_ALERTS} :- Process STOPPED"
    errorText="EMAIL BODY"
    
     nohup sendAlertMail.ksh "$errorText" "$errorSubject" "$EMAIL_LIST" 2>&1 &

     #echo "${errorText}" | mailx -s "${errorSubject}" ${EMAIL_LIST}

    SrcExitLoop="TRUE"
    exit 0
fi
done

the script sendAlertMail.ksh will be like this or u can modify as per ur requirements

Code:
#! /bin/ksh
echo "$1" | mailx -s "$2" "$3"

# 4  
Old 05-25-2012
CPU & Memory
Thanks all for your reply!!Smilie

I have tried to put the query and email command in no hup but still the some times we are missing one email.

Again there is no need to recevie the email on exact time...but we have to recevie all the emails...I think I have to modify the script (use counter) to get all the emails. Smilie

Thoughts??

Thanks again for your help!
# 5  
Old 05-25-2012
put THRESHOLD time to 59. I this case it will not send the mail 6 times but chances are there that 5 mails can be sent.

also try putting the if and else part in separate file with mail option and call it in background with passing argument. will take less of your looping time.
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