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Full Discussion: How to lock a file in unix?
Top Forums UNIX for Dummies Questions & Answers How to lock a file in unix? Post 2636 by Neo on Friday 25th of May 2001 12:00:41 PM
Old 05-25-2001
In this situation, people usually create a test condition before opening the file and operating on the sequence number. The normal test condition is the existance of a temporary file i.e. yourprogramname.LOCK.

Before a script or command opens the file, it first tests for the existance of the LOCK file. If the file exists, the process terminates. How it terminates depends on the user requirements.

That is how it is normally done with scripts. If you need a more atomic method, you must use system calls closer to the kernel and this will require C (or some other) programming wrapper.
 

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Dist::Zilla::App::Command::test(3pm)			User Contributed Perl Documentation		      Dist::Zilla::App::Command::test(3pm)

NAME
Dist::Zilla::App::Command::test - test your dist VERSION
version 4.300020 SYNOPSIS
dzil test [ --release ] [ --no-author ] [ --automated ] [ --all ] DESCRIPTION
This command is a thin wrapper around the test method in Dist::Zilla. It builds your dist and runs the tests with the AUTHOR_TESTING environment variable turned on, so it's like doing this: export AUTHOR_TESTING=1 dzil build --no-tgz cd $BUILD_DIRECTORY perl Makefile.PL make make test A build that fails tests will be left behind for analysis, and dzil will exit a non-zero value. If the tests are successful, the build directory will be removed and dzil will exit with status 0. OPTIONS
--release This will run the test suite with RELEASE_TESTING=1 --automated This will run the test suite with AUTOMATED_TESTING=1 --no-author This will run the test suite without setting AUTHOR_TESTING --all Equivalent to --release --automated --author AUTHOR
Ricardo SIGNES <rjbs@cpan.org> COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Ricardo SIGNES. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2012-06-21 Dist::Zilla::App::Command::test(3pm)
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