in reply to Is Process Running In The Background?

This is a FAQ: How do I find out if I'm running interactively or not?

Update: Fixed the link, thanks carol!
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Re^2: Is Process Running In The Background?
by carol (Beadle) on Apr 29, 2008 at 05:28 UTC
[reply]
[d/l]
Re^2: Is Process Running In The Background?
by gokuraku (Monk) on May 01, 2008 at 13:35 UTC
    Very nice...thank you it is what I needed.
    This is running on HPUX and the one I found that works is the following: 
    $tpgrp = tcgetpgrp(fileno(*TTY));
$pgrp = getpgrp();
if ($tpgrp == $pgrp) {
    system("which which > whichtest");
} else {
    print "Skipping which as we are not interactive.\n";
}

    [download]
    I needed a change in this as the system call on HPUX gets the shell into a waiting state until it receives some input, which does not work well if we run it as a background process. Rather than skip doing this as a check, which we could do as the script is run manually at times, I wanted a way to have it run only when we needed it.
[reply]
[d/l]

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