+ ----- 2012-01:
+ de.comp.datenbanken.ms-access 84
+ de.comp.datenbanken.mysql 88
+ ----- 2012-02:
+ de.comp.datenbanken.ms-access 126
+ de.comp.datenbanken.mysql 21
+
+The results can be grouped by newsgroups instead via
+B<--group-by> I<newsgroup>:
+
+ ----- de.comp.datenbanken.ms-access:
+ 2012-01 84
+ 2012-02 126
+ ----- de.comp.datenbanken.mysql:
+ 2012-01 88
+ 2012-02 21
+
+By appending I<-desc> to the group-by option parameter, you can reverse
+the sort order - e.g. B<--group-by> I<month-desc> will give:
+
+ ----- 2012-02:
+ de.comp.datenbanken.ms-access 126
+ de.comp.datenbanken.mysql 21
+ ----- 2012-01:
+ de.comp.datenbanken.ms-access 84
+ de.comp.datenbanken.mysql 88
+
+Average and sums reports (see above) will always be grouped by months;
+this option will therefore be ignored.
+
+=item B<-o>, B<--order-by> I<default[-desc]|postings[-desc]>
+
+Within each group (a single month or single newsgroup, see above), the
+report will be sorted by newsgroup names in ascending alphabetical order
+by default. You can change the sort order to descending or sort by number
+of postings instead.
+
+=item B<-f>, B<--format> I<pretty|list|dump>
+
+Select the output format, I<pretty> being the default:
+
+ ----- 2012-01:
+ de.comp.datenbanken.ms-access 84
+ de.comp.datenbanken.mysql 88
+ ----- 2012-02:
+ de.comp.datenbanken.ms-access 126
+ de.comp.datenbanken.mysql 21
+
+I<list> format looks like this:
+
+ 2012-01 de.comp.datenbanken.ms-access 84
+ 2012-01 de.comp.datenbanken.mysql 88
+ 2012-02 de.comp.datenbanken.ms-access 126
+ 2012-02 de.comp.datenbanken.mysql 21
+
+And I<dump> format looks like this:
+
+ # 2012-01:
+ de.comp.datenbanken.ms-access 84
+ de.comp.datenbanken.mysql 88
+ # 2012-02:
+ de.comp.datenbanken.ms-access 126
+ de.comp.datenbanken.mysql 21
+
+You can remove the comments by using B<--nocomments>, see below.
+
+=item B<-c>, B<--captions|--nocaptions>
+
+Add captions to output, like this:
+
+ ----- Report for 2012-01 to 2012-02 (number of postings for each month)
+ ----- Newsgroups: de.comp.datenbanken.*
+ ----- Threshold: 10 => x <= 20 (on average)
+ ----- Grouped by Newsgroups (ascending), sorted by number of postings descending
+
+False by default.
+
+=item B<--comments|--nocomments>
+
+Add comments (group headers) to I<dump> and I<pretty> output. True by default.
+
+Use I<--nocomments> to suppress anything except newsgroup names/months and
+numbers of postings. This is enforced when using B<--filetemplate>, see below.
+
+=item B<--filetemplate> I<filename template>
+
+Save output to file(s) instead of dumping it to STDOUT. B<groupstats> will
+create one file for each month (or each newsgroup, accordant to the
+setting of B<--group-by>, see above), with filenames composed by adding
+year and month (or newsgroup names) to the I<filename template>, for
+example with B<--filetemplate> I<stats>:
+
+ stats-2012-01
+ stats-2012-02