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Killing processes in scripts


 
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# 1  
Old 07-15-2002
Killing processes in scripts

I have a small problem. It's annoying though. I wrote this shell script:
Code:
#
# This script will accept two arguments. The first is a flag and the
# second is a time interval. The only valid flag is '-t' which means
# the user will specify the interval in seconds, otherwise the 
# default is 600 seconds. While the interval is counting, the script
# will run the ps command, cut out the process numbers, and
# place them in a temp file. When the interval is met the script 
# calls another script which uses the temp file and outputs
# the current time, the number of users logged on, and the
# number of processes run during the interval. It will continually
# loop until the script is killed by ^Z.

while [ 1 -eq 1 ]; do

  if test {$1}

  then if [ "$1" = "-t" ]
          then sleep $2; sh colfile &
                let timec=0
                  while [ timec -le $2 ]
                  do
                    ps | cut -f2 -d" " >> proc.tmp
                    let timec=timec+1
                    sleep 1
                  done
           else exit
       fi

  else sleep 5; sh colfile &
       let timec=0
          while [ timec -le 600 ]
          do
            ps | cut -f2 -d" " >> proc.tmp
            let timec=timec+1
            sleep 1
          done
  fi

done

My problem is that when I run it most of the time it will create multiple instances of itself and I have to individually kill each process. I don't know if it is because I don't have an end to the program and have to press ^Z to stop the program or what it is.

When I typed the command:
Code:
sh collect -t 2

After stopping it I did a ps and got this:
Code:
   PID    TTY  TIME CMD
 29372  pts/4  0:00 sh collect -t 2
 33282  pts/4  0:01 -ksh
 37414  pts/4  0:00 ps
 41604  pts/4  0:00 sh collect -t 2
 46194  pts/4  0:00 sh collect -t 2

Notice the 3 instances it created? Does anyone know why it is doing that and how I can stop it or kill the processes right in my script?

Thanks

Last edited by Yogesh Sawant; 06-23-2009 at 04:07 AM.. Reason: added code tags
# 2  
Old 07-16-2002
Can you post the output of ps -f ? This will show if those other processes are children of the one you started.

Your script does not start other processes running your collect script - what does the colfile script do? Does it start collect jobs?
# 3  
Old 07-16-2002
Hi

Your program contenting three loops, the first one is always true, and second, third depends on the conditions, however, there are 3 process running in your program as the OS treated... ^Z only suspend these 3 process on the backgroud, didn't stop them, advise you stop ur program by ^C...

Your program haven't test yet, but quiet challengableSmilie
# 4  
Old 07-17-2002
I tried the ^c instead of ^z and it did kill the process. But for some reason it isn't creating the multiple processes now. It is probably because I am interfacing directly with the server on it's own network instead of from home with that glitchy terminal emulator I am using. Whatever the reason thanks for the help.

BTW, I used the first loop that is always true because I didn't know a better way of having it run indefinitely in the background. I am going to incorporate a kill time into it later today or tomorrow to specify the time to run.

Thanks

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