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

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