+
+ Limit the number of displayed results to N.
+
+ <b>--exclude=(true|false|all|flag)</b>
+
+ A message is called "excluded" if it matches at least one
+ tag in search.tag_exclude that does not appear explicitly in
+ the search terms. This option specifies whether to omit
+ excluded messages in the search process.
+
+ The default value, <b>true</b>, prevents excluded messages from
+ matching the search terms.
+
+ <b>all</b> additionally prevents excluded messages from appearing
+ in displayed results, in effect behaving as though the
+ excluded messages do not exist.
+
+ <b>false</b> allows excluded messages to match search terms and
+ appear in displayed results. Excluded messages are still
+ marked in the relevant outputs.
+
+ <b>flag</b> only has an effect when --output=summary. The output is
+ almost identical to <b>false</b>, but the "match count" is the num-
+ ber of matching non-excluded messages in the thread, rather
+ than the number of matching messages.
+
+ <b>--duplicate=N</b>
+
+ Effective with --output=files, output the Nth filename asso-
+ ciated with each message matching the query (N is 1-based).
+ If N is greater than the number of files associated with the
+ message, don't print anything.
+
+ Note that this option is orthogonal with the <b>folder:</b> search
+ prefix. The prefix matches messages based on filenames. This
+ option filters filenames of the matching messages.