I want to write a simple perl program that goes through the current folder recursively and looks at each item, if it's a file, print its contents and moves on to the next one.

I am a beginner Perl programmer, and I don't know why this is happening, but this perl program stops responding, and then I have to kill it every time.

I am using TinyPerl 5.8 under Windows 7.

I am testing this program in a folder that has about 50 text files and no folders. When I launch my perl program, it seems to work perfectly fine, but it doesn't go back to command prompt. It just hangs. The cursor stops blinking, and I have to kill the process.

If I only read the first 100 bytes of each file, then there's no issue. I am back to command prompt immediately. If I read the first 2000 bytes, then there's a 3-second delay. And I tried reading the entire file and print the content, but then after executing the script, it stopped responding and I had to kill it. 

use strict;
use warnings;

my $PATH = '.';
my $CONTENT;

explore($PATH);

sub explore
{
  my $PATH = shift;
  my $FILE;
  my $SUB;

  opendir(my $DIR, $PATH) or return;
  while (my $SUB = readdir $DIR)
  {
    next if $SUB eq '.' or $SUB eq '..';
    $SUB = "$PATH/$SUB";

    # If it's a folder, explore it.
    # If it's a file, print it.

    if (-d $SUB)
    {
      explore($SUB);
      next;
    }
    if (-f $SUB)
    {
      open($FILE, '<:raw', $SUB) or next;
      read($FILE, $CONTENT, 2000) or next;
      close($FILE);
      print $CONTENT;
      $CONTENT = '';  # don't need this data anymore
    }
  }
  close $DIR;
}

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In reply to print all files is soo slow! Why? by harangzsolt33

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