这时，进程的有效用户ID必须和文件的拥有者ID一致，或者进程必须拥有文件的写权限。

To do this, either the effective user ID of the porcess must equal the owner ID of the file, or the process must have write permission for the file.

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这种情况下，进程的有效用户ID等于文件拥有者的ID，或者进程是超级进程，仅仅有文件的写权限是不够的。

For this case, the effective user ID of the process must equal the owner ID of the file, or the process must be a superuser process. Merely having write permission for the file is not adequate.

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