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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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SPECRB(1)																 SPECRB(1)

NAME
specrb - standalone test runner for test/spec and Test::Unit test suites SYNOPSIS
specrb [OPTIONS] [FILES | -a ] [-- untouched arguments] DESCRIPTION
The Ruby script specrb allows you to run tests written with test/spec from the command line. It can also be used for plain Test::Unit test suites. You can either specify the names of the test files you want to run, or let specrb find automatically all the tests in your project, by using the -a switch (see TEST/SPEC OPTIONS below). You can also use various options on the command line to pass parameters to the Ruby interpreterm or to modify the behavior of test/spec and/or test/unit. RUBY OPTIONS
-e, --eval LINE evaluate a LINE of code -d, --debug set debugging flags (set $DEBUG to true) -w, --warn turn warnings on for your script -I, --include PATH specify $LOAD_PATH (may be used more than once) -r, --require LIBRARY require the LIBRARY, before executing your script TEST
/SPEC OPTIONS: -s, --specdox do AgileDox-like output --rdox do AgileDox-like output with RDoc formatting -a, --automatic gather tests from ./test/, include ./lib/ TEST
::UNIT OPTIONS: -n, --name NAME runs tests matching regexp NAME -t, --testcase TESTCASE runs tests in TestCases matching regexp TESTCASE COMMON OPTIONS
: -h, --help show a message similar to this manpage --version show version AUTHORS
The test/spec library has been written by Christian Neukirchen <http://purl.org/net/chneukirchen>. This manual page, inspired by the help message of specrb, has been written for the Debian Project by Cedric Boutillier (but may used by others). 2012-06-26 SPECRB(1)
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