Here is some code I wrote back in 2001 that takes advantage of the fact that we can push onto an array we are currently iterating over. So it's called an infinite stream eh, cute name. Anyway this happily recurses a directory (or any other) tree. 

my $root  = 'c:/somedir/';
my @dirs  = ($root);
my @files;

for my $path (@dirs){
    opendir ( DIR, $path ) or next;   # skip dirs we can't read
    while (my $file = readdir DIR) {
      next if $file eq '.' or $file eq '..';# skip dot files
      next if -l $path.$file;              # skip sym links
        if ( -d $path.$file ) {
            push @dirs, $path.$file.'/';   # add dir to list
        }
        else {
            push @files, $path.$file;    # add file to list
        }
    }
    closedir DIR;
}

[download]

In reply to Re^3: Eliminating Recursive Tree Walking by using MJD-style Infinite Streams? by Anonymous Monk
in thread Eliminating Recursive Tree Walking by using MJD-style Infinite Streams? by jryan

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.