Egad, but I love this place. I could stay here<KBD> while(1); ...</KBD>:)
The recent thread on directory recursion prompts a question:
With scant experience with Perl and no grasp of how a recursive
function works, I was stumped by this same problem. An unusually
patient C programmer at work explained recursion to me enough times that
I finally (sort of) got it. At the time I knew nothing about opendir
or readdir, though I understood glob a bit. I ended up writing: 
walktree('d:/perl');

sub walktree {
  print "$_[0]\n"; # or real-world stuff here
  for ( glob("$_[0]/*") ) {
    -d && walktree($_);
  }
}

[download]

or these alternatives: 

  for (grep(-d, glob("$_[0]/*"))) {
    walktree($_);
  }

  walktree($_) for (grep(-d, glob("$_[0]/*")));

[download]
To my amazement, they worked, though I'm still not entirely sure why.
I have since found that ways of doing it with opendir and readdir execute
much faster. But, execution speed aside: is there anything massively
dumb (or, worst of all, deprecated :) about using glob this way?

In reply to More on directory recursion by greenhorn

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