Note that this can only save you while you're trying to redirect output to an existing file — it isn't any help if you're using cp or mv to overwrite the file.

注意，这只能防止把输出重定向到现有文件；如果使用cp或mv覆盖文件，这个变量没有任何帮助。

youdao

You should also be careful to ensure that you don't accidentally overwrite a partition, or existing files, with the files you are trying to copy.

您还应该注意，务必避免用要复制的文件意外地覆盖分区或现有的文件。

youdao