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Subject Author Date
trying to execute 'at now + 2 minutes... mmccaws2 03-17-2008
Posted by mmccaws2 on March 17, 2008, 11:10 am
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 Hi

On unix I'll run a command at the command line like

> at now + 2 minutes
> ./trial.pl &
> Ctrl d

how do I do this from within a script?

Thanks
Mike

Posted by Randal L. Schwartz on March 17, 2008, 11:37 am
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mmccaws2> Hi
mmccaws2> On unix I'll run a command at the command line like

>> at now + 2 minutes
>> ./trial.pl &
>> Ctrl d

mmccaws2> how do I do this from within a script?

open AT, "|at now + 2 minutes" or die $!;
print AT "./trial.pl"; # not sure why you backgrounded that.
close AT;

Or, if you don't really need "at", and you just want to execute something
in two minutes, you can simply fork:

defined(my $kid = fork) or die "Cannot fork: $!";
unless ($kid) { # child does...
sleep 2 * 60; # two minutes, measured in seconds
exec "./trial.pl"; # for example, or just do it in line
exit 0;
}

$kid's pid will show up on a waitpid() call later, so you need to wait for it
eventually or exit soon, or you can double fork and wait if you don't want the
zombie.

print "Just another Perl hacker,"; # the original, #0 :)

--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
Perl/Unix/security consulting, Technical writing, Comedy, etc. etc.
See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!

Posted by sandy_saydakov on March 17, 2008, 11:45 am
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>
> On unix I'll run a command at the command line like
>
> > at now + 2 minutes
> > ./trial.pl &
> > Ctrl d
>
> how do I do this from within a script?

Perhaps, sleep($seconds) first would do it for you.

/sandy
http://myperlquiz.com/

Posted by xhoster on March 17, 2008, 11:51 am
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> Hi
>
> On unix I'll run a command at the command line like
>
> > at now + 2 minutes
> > ./trial.pl &
> > Ctrl d
>
> how do I do this from within a script?

open my $at, "| at now + 2 minutes" or die $!;
print $at './trial.pl&';
close $at or die $!;

Or you could do it strictly in Perl using fork and sleep and exec.

Xho

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Posted by mmccaws2 on March 17, 2008, 12:10 pm
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On Mar 17, 8:51 am, xhos...@gmail.com wrote:
> > Hi
>
> > On unix I'll run a command at the command line like
>
> > > at now + 2 minutes
> > > ./trial.pl &
> > > Ctrl d
>
> > how do I do this from within a script?
>
> open my $at, "| at now + 2 minutes" or die $!;
> print $at './trial.pl&';
> close $at or die $!;
>
> Or you could do it strictly in Perl using fork and sleep and exec.
>
> Xho
>
> --
> --------------------http://NewsReader.Com/--------------------
> The costs of publication of this article were defrayed in part by the
> payment of page charges. This article must therefore be hereby marked
> advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate
> this fact.

Thanks everyone

it works great.

Mike

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