[NBLUG/talk] Mutual exclusion in shell scripts?

Lincoln Peters sampln at sbcglobal.net
Sat Jan 20 18:00:42 PST 2007

On Saturday 20 January 2007 16:23, Eric Eisenhart wrote:
> 1) procmail comes with "lockfile" that's designed to do what you want.

Except I'm trying to use this as a manual filter in KMail.

> 2) check for lock and create at once using a single atomic file operation:
> while ! ln -s $$ /tmp/filter.lock 2> /dev/null
> do
>     sleep 10
> done
> sa-learn $1 --no-sync
> rm -f /tmp/filter.lock

At first it looks more like an exercise in obfuscated code than anything else, 
but I think I see why this would work.  I'll try it.

Lincoln Peters		<sampln at sbcglobal.net>

Now there's three things you can do in a baseball game: you can win
or you can lose or it can rain.
		-- Casey Stengel

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