June 2004
Intermediate to advanced
1056 pages
39h 58m
English
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Name
lockfile
Synopsis
lockfile [options]filenames
Creates semaphore file(s), used to limit access to a file. When
lockfile fails to create some of the specified
files, it pauses for eight seconds and retries the last one on which
it failed. The command processes flags as they are encountered (i.e.,
a flag that is specified after a file won’t affect
that file).
Options
-
-sleeptime Time
lockfilewaits before retrying after a failed creation attempt. Default is eight seconds.-
-! Invert return value. Useful in shell scripts.
-
-llockout_time Time (in seconds) after a lockfile was last modified at which it will be removed by force. See also
-s.-
-ml,-mu If the permissions on the system mail spool directory allow it or if
lockfileis suitably setgid, it can lock and unlock your system mailbox with the options-mland-mu, respectively.-
-rretries Stop trying to create
filesafterretriesretries. The default is -1 (never stop trying). When giving up, remove all created files.-
-ssuspend_time After a lockfile has been removed by force (see
-l), a suspension of 16 seconds takes place by default. (This is intended to prevent the inadvertent immediate removal of any lockfile newly created by another program.) Use-sto change the default 16 seconds.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.