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Perl: the Markov chain saw

Find out where symlinks point

by merlyn (Sage)
on Aug 09, 2000 at 15:31 UTC ( #27007=sourcecode: print w/replies, xml ) Need Help??
Category: Utility Scripts
Author/Contact Info Randal L. Schwartz, aka merlyn
Description: Walks through one or more directories specified on command line, and fully expands any symbolic links within those directories to their real locations, taking into consideration all the relative and absolute symlinks that occur, recursively. Originally written for a Performance Computing/SysAdmin magazine Perl column. Go see there for a line by line description.
#!/usr/bin/perl -w
use strict;

use File::Find;
use Cwd;

my $dir = cwd;

find sub {
  return unless -l;

  my @right = split /\//, $File::Find::name;

  my @left = do {
    @right && ($right[0] eq "") ?
      shift @right :            # quick way
        split /\//, $dir;
  };    # first element always null

  while (@right) {
    my $item = shift @right;
    next if $item eq "." or $item eq "";

    if ($item eq "..") {
      pop @left if @left > 1;

    my $link = readlink (join "/", @left, $item);

    if (defined $link) {
      my @parts = split /\//, $link;
      if (@parts && ($parts[0] eq "")) { # absolute
        @left = shift @parts;   # quick way
      unshift @right, @parts;
    } else {
      push @left, $item;
  print "$File::Find::name is ", join("/", @left), "\n";

}, @ARGV;
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Node Type: sourcecode [id://27007]
[choroba]: It's just troll feeding.
[beech]: of course the magic word that explains everything :p
[erix]: they should lean to gnash their teeth a bit instead of writing more ^Re:NN-nodes :)
[erix]: *learn

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