What are all the ways to traverse directory trees?

Question

How do you traverse a directory tree in your favorite language?

What do you need to know to traverse a directory tree in different operating systems? On different f

Answer 1

In C#:

Stack dirs = new Stack();

dirs.Push(new DirectoryInfo("C:\\"));

while (dirs.Count > 0) {
    DirectoryInfo current = dirs.Pop();

    // Do something with 'current' (if you want)

    Array.ForEach(current.GetFiles(), delegate(FileInfo f)
    {
        // Do something with 'f'
    });

    Array.ForEach(current.GetDirectories(), delegate(DirectoryInfo d)
    {
        dirs.Push(d);
    });
}