怎样判断某文件是否存在？

How to determine whether a file exists?

youdao

这意思是说你对某文件做出更改的时候需要改变文件的许可。

This means you need to change the file permissions before you can make changes to the file.

youdao

当你排除某文件名或文件类型，杀软会完全无视系统上的此类文件，这会带来安全隐患。

When you exclude a filename or file extension, you are telling your antivirus software to completely ignore those files anywhere on your system, which could cause a security problem.

youdao