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

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

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

open FH, '<', $file or die "Can't read '$file': $!";
# find out what kind of line endings we have
...
   print STDERR "'$_'\n";
}
close FH;