您可以禁用写权限位，例如要防止删除文件。

You might disable your write bit, for example, to prevent the file from being deleted.

youdao

现在，ACL 已定义成赋予根用户读、写和执行权限，但没有删除权限位（即 “d”）。

Now, the ACL is defined to give the root user read, write, and execute permissions, but not the deletion (that is, the "d") permission bit.

youdao

在最近的一些 Linux 机器上，使用普通的旧 /bin/cp 复制的文件都因为权限位不正确而终止使用。

On some recent Linux machines, files copied with plain old /bin/cp were ending up with incorrect permission bits.

youdao