#!/usr/bin/perl --
use strict; use warnings;
use Data::Dump qw/ dd /;
my $line = q{11/21/2010  05:02 AM     1,572,696,748 IN11-135.E05};

#11/21/2010  05:02 AM     1,572,696,748 IN11-135.E05
#1234567890  12345678 12345678901234567 
# date A10   time +A8    size A18       filename the rest
# x2 to ignore spaces between date and time
my( $date, $time, $sizewithcommas, $name ) = unpack "A10 x2 A8 x1 A18  A*", $line;

dd( [ $date, $time, $sizewithcommas, $name ] );


my $raw = q{
03/19/2011  04:01 PM             1,451 filename
09/07/2011  05:15 AM    <DIR>          dirname
};

open my($fh), '<', \$raw ;
while(<$fh>){
   my( $datetime, $filesizeordirindicator, $filename ) = eval { unpack 'A20 A18 x1 A*', $_ };
   warn $@ if $@;
   dd([ $datetime, $filesizeordirindicator, $filename ]);
}
__END__
["11/21/2010", "05:02 AM", "    1,572,696,748", "IN11-135.E05"]
'x' outside of string in unpack at crap line 22, <$fh> line 1.
[undef, undef, undef]
["03/19/2011  04:01 PM", "             1,451", "filename"]
["09/07/2011  05:15 AM", "    <DIR>", "dirname"]