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How do i obtain the PID of a program already running.

by Adityad (Initiate)
on Jun 29, 2000 at 19:05 UTC ( #20387=perlquestion: print w/replies, xml ) Need Help??

Adityad has asked for the wisdom of the Perl Monks concerning the following question:

How do i find out the PID of a program that is already running, outside my perl script. eg. suppose calc.exe is running and i want to find out its PID how, do i do that. Also what is the syntax for Ps.

Originally posted as a Categorized Question.

  • Comment on How do i obtain the PID of a program already running.

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Re: How do i obtain the PID of a program already running.
by QandAEditors on Jun 29, 2000 at 19:29 UTC
    The options on ps vary greatly from one OS to another. Use your system's man command to find the syntax of ps for your os.

    The Proc::ProcessTable module gives you a relatively OS independant way of getting and working with a process list. -- lhoward

Re: How do i obtain the PID of a program already running.
by QandAEditors on Jun 29, 2000 at 19:21 UTC
    Your first question, how to find the process id for a process running completely independent of your perl script, you can use ps.

    As for your second question, the syntax for ps can differ depending on which UNIX architecture you're on, which version of it, and even which version of ps is installed. A good place to start is by looking at the man page for ps.

    What confuses me is that you as about ps, but you also mention calc.exe running. This sounds like a Windows app, not UNIX. There's no ps (without some toolkit) native to windows.

    For windows, I can suggest either getting one of these toolkits (such as the Resource Kits), or using a perl module (a quick search for one didn't turn up anything, but there's probably one out there).

    Hope that helps.

    Update: Suggested by lhoward, Proc::ProcessTable is the perl module you're looking for.
Re: How do i obtain the PID of a program already running.
by QandAEditors on Jun 29, 2000 at 19:21 UTC
    ps -C program_name

    From the Chatterbox earlier today, you were wanting to kill all the apache PID's with Perl...

    shell> ps -C httpd | perl -pe '($_)=/(\d+)/;`kill -9 $_`'
    
    That should work as root

    Enjoy!

    --
    Casey
    
      I can't update my own posts... grrr!

      Change perl -pe to perl -ne actually...

      ps -C httpd|perl -ne'($_)=/(\d+)/;`kill -9 $_` if $_'
      
      That seems better to me.
      --
      Casey
      

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