除了特定的用户所有者，每个文件和目录还具有一个组所有者。
In addition to a specific user owner, every file and directory also has a group owner.
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.
用户可以在这个目录中添加其他文件，比如外部例程的可执行代码。
The user is free to add additional files, such as executables for external routines, to the directory.
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