cvs标志问题

要了解任何命令的作用，请使用 Unix/Linux/OS X 手册页：

人简历

无论如何，直接从标题“更新选项”下的那些页面：

-P

         Prune empty directories.  See see node `Removing directories' in the CVS
         manual.

-A

         Reset any sticky tags, dates, or -k options.  See see node `Sticky tags'
         in the CVS manual, for more information on sticky tags/dates.

-d

         Create  any  directories that exist in the repository if they're missing
         from the working directory.  Normally, update acts only  on  directories
         and files that were already enrolled in your working directory.

         This is useful for updating directories that were created in the reposi-
         tory since the initial checkout; but it has an unfortunate side  effect.
         If  you  deliberately avoided certain directories in the repository when
         you created your working directory (either through use of a module  name
         or  by  listing  explicitly  the files and directories you wanted on the
         command line), then updating with  -d  will  create  those  directories,
         which may not be what you want

基本上它将签出的分支恢复到最新版本。

-P 修剪空目录 -A 重置粘性标签 -d 创建存储库中存在但本地缺少的目录。

参见：http: //ximbiot.com/cvs/wiki/CVS--Concurrent%20Versions%20System%20v1.12.12.1%3A%20Guide%20to%20CVS%20commands#SEC172