-PAd是什么意思，当我使用CVS更新？
要找出什么命令使用Unix / Linux / OS X手册页：
男人cvs
无论如何，直接从“更新选项”标题下的这些页面：
-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 基本上它恢复检查分支到最新版本。
-P修剪空白目录-A重置粘性标签-d创build存储库上存在但在本地丢失的目录。
请参阅： http : //ximbiot.com/cvs/wiki/CVS–Concurrent%20Versions%20System%20v1.12.12.1%3A%20Guide%20to%20CVS%20commands#SEC172