Here is some code that may help you...
File::Find is a module that is most likely included in your Perl distribution without having to install anything.
Update: File::Find is a core module, so it is for sure in your installation. There are other similar modules. File::Find does the recursion without you having to think much about it.

Update:See following posts.. evidently some "system" Perls on Unix machines may not have all of the Core modules! Users are well advised to install their own Perl environment. I do most of my work nowadays on Windows (which doesn't come with Perl) so the issues are different. The code below is multi-platform (I tested on Windows), but you do need File::Find.

Pay attention to the error messages for invalid command line input.

#!/usr/bin/perl 

use strict;
use warnings;
use File::Find;

my $path = shift;   # what you expect to happen!
                    # @ARGV contains one thing which is
                    # a path to a directory. This shift removes
                    # that path from @ARGV and it goes to $path
                    
# Now check if the "normal case" is correct or not...                 
+  

usage("no directory specified") if !defined $path;
usage("too many arguments. Only one dir allowed") if (@ARGV !=0 ); 
usage("$path does not exist") if (not -e $path);
usage("$path is not a directory") if (not -d $path);

sub usage
{
   my $msg = shift;
   print STDERR "$msg\n";
   exit (1);        # exit(0) is success, all other values
                    # mean a failure as per common practice
}

find(\&each_file, $path); # each_file() is called for every
                          # file underneath $path.
                          # Note that a directory is a special
                          # kind of a file. -f tests if this name
                          # is a "simple file".

sub each_file
{
   # your code goes below...
   # $File::Find::name is the current file in this recursive
   # descent underneath the directory $path
   #
   
   if (-f $File::Find::name) #a simple file (NOT ., .., Or any other d
+irectory)
   {
      print "$File::Find::name\n"; #current file name
      # I would make an HTML sub to call here for that name..
   }
}
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