LinuxSA Mailing list archives

  From: David Newall <davidn@rebel.net.au>
  To  : Horst Poehlmann <Horst.Poehlmann@pobox.com>
  Date: Fri, 29 Jun 2001 15:33:49 +0930 (CST)

Re: ps and processes

> I run a program that monitors if a process is still running.

You're doing it wrong.  You're probably doing it like this:

  bash$ cat startjobs
  perl /usr/bin/swatch ... &
  per /usr/ bin/swatch ... &

  bash$ cat monitorjobs
  PID=`ps axuw|grep -v grep|grep '/usr/bin/swatch'|cut -f2`
  [ -z "$PID" ] && {
    # process has died
  }

You should be doing it like this:

  bash$ cat startjobs
  monitorjob perl /usr/sbin/swatch ... &
  monitorjob perl /usr/sbin/swatch ... &

  bash$ cat monitorjob
  exec "$@"
  # process has died

  or, to autorestart the job:

  bash$ cat monitorjob
  while :
  do
    exec "$@"
    # process has died
  done

shar and enjoy! (as they used to say.)

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