+(defun gnus-summary-save-in-pipe (&optional command raw)
+ "Pipe this article to subprocess COMMAND.
+Valid values for COMMAND include:
+ a string
+ The executable command name and possibly arguments.
+ nil
+ You will be prompted for the command in the minibuffer.
+ the symbol `default'
+ It will be replaced with the command which the variable
+ `gnus-summary-pipe-output-default-command' holds or the command
+ last used for saving.
+Non-nil value for RAW overrides `:decode' and `:headers' properties
+and the raw article including all headers will be piped."