Where is the file name usually saved in the system?

In operating systems, the filename is usually stored in the file system metadata, specifically in a structure called a directory. The directory contains entries linking the filename to its physical location on disk.

In Go, when working with files, the filename is typically passed and stored as a string variable, but the filename itself is stored in the filesystem, not in the program's memory. For example:

file, err := os.Open("example.txt")
if err != nil {
    // handle error
}
// file.Name() returns the filename
fmt.Println(file.Name())

Here, file.Name() returns the filename used when opening, but the filename itself is stored in the filesystem, not in the program.