+=item B<-c>, B<--count>
+
+Omit repetitions and count the number of occurrences.
+Similar to piping input through C<sort | uniq -c>
+but keeping the order of first appearances.
+
+Lines are omitted if they (or a specified field) are identical,
+and the amount of matches is prepended and used as values
+for bars and subsequent statistics.
+
+=item B<-f>, B<--field>=([B<+>]I<number> | I<regexp>)