-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
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:
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