Exists reports whether the path exists.

IsDir reports whether the path exists and is a directory.

IsExecutable reports whether the path exists and is executable.

IsFile reports whether the path exists and is a file.

IsHiddenFile reports whether the path exists and is included hidden file.

IsReadable reports whether the path exists and is readable.

IsSymlink reports whether the path exists and is a symbolic link.

IsWritable reports whether the path exists and is writable.

IsZero reports whether the path exists and is zero size.

Executable : executable bits.

Readable : readable bits.

Unknown : Don't use this bits.

Writable : writable bits.