这个开关不会自动删除系统中所有属于这个用户的文件，只是删除他的主目录。
This switch will not automatically delete all the files on the system that belong to the user, just the home directory.
场景：您发现您已经在实例主目录中创建了数据库，而不是像期望的那样，在一个更大的、专门的文件系统中创建该数据库。
Scenario: You’ve realized that you’ve created your database in your instance’s home directory and not on a larger, dedicated file system like you intended.
如果主目录已经存在，或者已经在系统上成功创建它，就会返回PAM_SUCCESS。
It returns PAM_SUCCESS if the home directory already exists, or the home directory is successfully created on the system.
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