You can search for subjects or authors in many newsgroups, using some
of nn's command line flags.  These are the ones I use the most:

Type at Unix prompt  To search all groups, all articles, & merge results
===================  ===================================================
nn -mxXs"text"       search subjects for `text'
nn -mxXs/"regexp"    search subjects for regular expression `regexp'
nn -mxXn"text"       search authors' full names for `text'
nn -mxXn/"regexp"    search authors' full names for regular expression `regexp'


For each of these, if you don't specify anything else, all articles
in all newsgroups will be searched.  THIS CAN TAKE A REALLY LONG
TIME, so usually what I do is specify a hierarchy to search.  For
example to search all subjects in the sci hierarchy for "realism", I'd
use this:

 nn -mxXs"realism" sci.all

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