Usage: cvs update [-APdflRp] [-k kopt] [-r rev|-D date] [-j rev]
[-I ign] [-W spec] [files...]
-A Reset any sticky tags/date/kopts.
-P Prune empty directories.
-d Build directories, like checkout does.
-f Force a head revision match if tag/date not found.
-l Local directory only, no recursion.
-R Process directories recursively.
-p Send updates to standard output (avoids stickiness).
-k kopt Use RCS kopt -k option on checkout.
-r rev Update using specified revision/tag (is sticky).
-D date Set date to update from (is sticky).
-j rev Merge in changes made between current revision and rev.
-I ign More files to ignore (! to reset).
-W spec Wrappers specification line.
(Specify the --help global option for a list of other help options)