Any principal that is not RPC or a member of the admin group is considered a member of "others" and is granted the single read permission only.
不属于rpc或admin组成员的任何主体都被视为“Others”的成员，并且仅授予单一的读取权限。
User tom's home has execute but not read permission, so user ian cannot list the contents, but can access objects within the directory if he knows they exist.
用户tom的主目录有执行权限，但是没有读权限，所以用户ian不能列出内容，但是如果知道对象存在，就可以访问目录下的对象。
Read permission for a directory allows a user with that permission to list the contents of the directory.
目录的读权限允许用户使用该权限列出目录内容。
Read permission for a directory allows a user with that permission to list the contents of the directory.
目录的读权限允许用户使用该权限列出目录内容。
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