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List:       linux-hotplug
Subject:    Re: differences between "PROGRAM" and "RUN" (RUN+) (version 089)
From:       Kay Sievers <kay.sievers () vrfy ! org>
Date:       2006-04-10 18:01:57
Message-ID: 20060410180157.GA17138 () vrfy ! org
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On Mon, Apr 10, 2006 at 05:12:01PM +0300, Mark Ryden wrote:
> from man udev (of last version,089):
> 
> PROGRAM
> Call external program. This key is valid if the program returns
>   successful. The environment variables of udev are also available
> 	to the program.The string returned by the program may be
> 	additionally matched with the RESULT key in the same or
> 	any later rule.
> 
> RUN
>   Add a program to the list of programs to be executed for
> 	a specific device.
> 	
> Can anyone please elaborate a little on the differences between "PROGRAM" and
> "RUN" (RUN+) ?
> 
> Are the environment variables of udev available when
> using "run"?
> When must we use RUN (RUN+) and when must we use PROGRAM ?
> Are there cases when using RUN or PROGRAN  is both OK?

PROGRAM runs before the device node is created and usually used to return a
string to name a node. RUN is a list of programs to be executed after all
node processing. While PROGRAM is executed not all variables are
available.

Kay


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