From: Anthony R Fletcher <arif@mail.nih.gov>
To: <zsh-users@zsh.org>
Subject: Re: wait for the next process to finish
Date: Tue, 13 Dec 2011 11:59:29 -0500 [thread overview]
Message-ID: <20111213165929.GA10308@cosy.cit.nih.gov> (raw)
In-Reply-To: <CAFOazAN9KMUHaUZCMj7usd_m6NwGERdRZ-9Mc+-oP8jbtbsHOg@mail.gmail.com>
> 2011/12/13 Rory Mulvaney <rorymulv@gmail.com>:
> > To clarify (I think this is fairly simple), you can supply the process id
> > as a parameter to 'wait', and though the $! method seems rather clumsy to
> > retrieve the pid (since you have to retrieve it somehow in the next
> > command after spawning the background process), it seems to work mostly in
> > general.
> >
> > So you could do:
> >
> > sleep 20000 &
> > sleep 20 &
> > pid=$!
> > wait $pid
> >
> > That will just wait for the sleep 20 process to complete while the sleep
> > 20000 process still runs in the background.
>
> Actually, it'll always wait for the last spawned job, not for the
> first job to finish.
>
> If you spawn them in the reverse order, ie:
>
> sleep 20 &
> sleep 20000 &
> pid=$!
> wait $pid
>
> This will wait for the sleep 20000 process, even if the sleep 20 has
> finished for long.
Yes, the need to to wait for any of the processes to end so I can start
another. Basically a poor man's batch system.
Anthony.
--
Anthony R Fletcher
Room 2033, Building 12A, http://dcb.cit.nih.gov/~arif
National Institutes of Health, arif@mail.nih.gov
12A South Drive, Bethesda, Phone: (+1) 301 402 1741.
MD 20892-5624, USA.
next prev parent reply other threads:[~2011-12-13 17:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 15:46 Anthony R Fletcher
2011-12-12 16:37 ` TJ Luoma
2011-12-12 19:41 ` Wayne Davison
2011-12-13 7:15 ` Martin Richter
2011-12-13 16:07 ` Rory Mulvaney
2011-12-13 16:45 ` Jérémie Roquet
2011-12-13 16:59 ` Anthony R Fletcher [this message]
2011-12-13 18:08 ` Daniel Shahaf
2011-12-13 16:49 ` Christoph (Stucki) von Stuckrad
2011-12-13 17:31 ` Bart Schaefer
2011-12-13 17:04 ` Rory Mulvaney
2011-12-13 17:32 ` Anthony R Fletcher
2011-12-13 18:04 ` Jérémie Roquet
2011-12-13 18:20 ` Stephane Chazelas
2011-12-13 19:19 ` Anthony R Fletcher
2011-12-13 10:01 ` Peter Stephenson
2011-12-13 17:10 ` Bart Schaefer
2011-12-13 20:42 ` Rory Mulvaney
2011-12-13 17:45 ` Stephane Chazelas
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