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Gnus Manual

3.15.5.1 Rule Variables

Gnus uses rule variables to decide how to view a file. All these variables are of the form

(list '(regexp1 command2) '(regexp2 command2) ...)

gnus-uu-user-view-rules

This variable is consulted first when viewing files. If you wish to use, for instance, sox to convert an `.au' sound file, you could say something like:

(setq gnus-uu-user-view-rules (list '("\\\\.au$" "sox %s -t .aiff > /dev/audio")))

gnus-uu-user-view-rules-end

This variable is consulted if Gnus couldn't make any matches from the user and default view rules.

gnus-uu-user-archive-rules

This variable can be used to say what commands should be used to unpack archives.