local $/ = "\r\n";
while (<DATA>) {
   chomp $_;
   print STDERR "'$_'\n";
}

##</code><code>##

while (<DATA>) {
   s/\r[\n]*/\n/gm;  # now, an \r (Mac) or \r\n (Win) becomes \n (UNIX)
   chomp $_;
   print STDERR "'$_'\n";
}

##</code><code>##

   s/\r[\n]*//gm;

##</code><code>##

open FH, '<', $file or die "Can't read '$file': $!";
# find out what kind of line endings we have
my $buffer;
local $/ = undef;
while ( read( FH, $buffer, 1024 ) ) {
   if ( $buffer=~m/(\r[\n]*)/s ) {
      $/ = $1; # set the input separator to what we found
      last;    # stop trying to find the separator
   }
}
close FH;

# now reopen the FH and read line by line
open FH, '<', $file or die "Can't read '$file': $!";
while (<FH>) {
   chomp;
   print STDERR "'$_'\n";
}
close FH;