出现下面的问题是什么原因:
cvs commit -m four -r 2.0 (in directory D:\CVSRoot\aaa\database\)
cvs commit: Examining .
Usage: cvs server [DnRlf] [-B bug | -b bug ] [-m msg | -F logfile] files...
-b bugid Only commit files related to bug.
-B bugid Mark files with bug.
-c Check for valid edits before committing.
-D Assume all files are modified.
-F logfile Read the log message from file.
-e Keep edited files.
-f Force the file to be committed; disables recursion.
-n Do not run the module program (if any).
-l Local directory only (not recursive).
-m message Log message.
-R Process directories recursively.
(Specify the --help global option for a list of other help options)