On Friday 27 July 2007 13:33, John Greep wrote: > You can do simple locking by touching a file for the first instance and > checking for it in other instances. In pseudo code: > > while .lock exists > do nothing or wait a bit > end while > touch .lock > modify text file > delete .lock
But if a script dies before the delete, you've created an infinite queue. > > Roy Souther wrote: > > Is there anyway to do file locking in a bash script? I need to remove > > the race hazard from a script that has multiple running instances per > > user, each trying to make changes to a text file. I need to get > > exclusive access to a file and make the other instances wait their turn. > > > > Any ideas? Flock is supported by more advances script engines like > > Perl but flock seems to be beyond the ability of a simple shell like > > bash. > > > > _Royce Souther <mailto:[EMAIL PROTECTED]>_ > > _www.SiliconTao.com <http://www.SiliconTao.com>_ > > Let Open Source help your business move beyond. > > > > For security this message is digitally authenticated by _GnuPG > > <http://www.gnupg.org>_. > > > > > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > clug-talk mailing list > > [email protected] > > http://clug.ca/mailman/listinfo/clug-talk_clug.ca > > Mailing List Guidelines (http://clug.ca/ml_guidelines.php) > > **Please remove these lines when replying > > _______________________________________________ > clug-talk mailing list > [email protected] > http://clug.ca/mailman/listinfo/clug-talk_clug.ca > Mailing List Guidelines (http://clug.ca/ml_guidelines.php) > **Please remove these lines when replying _______________________________________________ clug-talk mailing list [email protected] http://clug.ca/mailman/listinfo/clug-talk_clug.ca Mailing List Guidelines (http://clug.ca/ml_guidelines.php) **Please remove these lines when replying
