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Shell Programming and Scripting
file descriptor KSH
Post 302522628 by LiorAmitai on Monday 16th of May 2011 05:38:34 AM
05-16-2011
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LEARN ABOUT NETBSD
flock
FLOCK(1) BSD General Commands Manual FLOCK(1) NAME
flock -- Provide locking API for shell scripts SYNOPSIS
flock [-dnosvx] [-w timeout] lockfile|lockdir [-c command] | [command ...] flock [-dnsuvx] [-w timeout] lockfd DESCRIPTION
The flock utility provides flock(2) access to the command line or scripts. The first form locks a file or directory while the command pro- vided is executed. If the file or directory does not exist, then a file is created. The second form can use an arbitrary file descriptor that is provided from a shell script for example: ( flock -s 100 # commands to be executed under the lock ) 100> /path/to/lockfile The following options are available: -c command Pass a command to a the shell. -d, --debug Provide debugging output. -n, --nb, --nonblock Don't block and fail immediately if the lock could not be obtained. -o, --close Close the file before executing the command. This is useful if the child forks and should not be holding the lock. -s, --shared Obtain a shared lock. -u, --unlock Unlock an existing lock. This is available only for a file descriptor. -v, --verbose On error print an explanation of the failure. -w, --wait, --timeout seconds Fail if the lock could not be obtained after seconds. -x, --exclusive Obtain an exclusive lock. EXIT STATUS
The flock utility exits 0 on success, and >0 if an error occurs. SEE ALSO
shlock(1), flock(2) HISTORY
An flock utility appeared in NetBSD 6.1. BSD
November 2, 2012 BSD