gnus-summary-pipe-output-default-command

gnus-summary-pipe-output-default-command is a variable defined in `gnus-sum.el'.
Its value is

nil

• This variable may be risky if used as a file-local variable.

Documentation:
Command (and optional arguments) used to pipe article to subprocess.
This will be used as the default command if it is non-nil. The value
will be updated if you modify it when executing the command
`gnus-summary-pipe-output' or the function `gnus-summary-save-in-pipe'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.