process_keys - Web of Trust analysis
       process_keys [ -S ]
       process_keys  takes  the  output  from  pgpring(1)  and  turns  it into
       suitable input for keyanalyze(1).
       pgpring must be called with the -S option to also dump signatures.
       It acts as a filter, reading from stdin and writing to stdout.
       -S     Accept keys that are not selfsigned.  Not recommended.
       Thomas Roessler <roessler@does-not-exist.org>
                                                               process_keys(1)