Greetings Brothers, I use a code repository that works on UNIX, so that the code may be accessed in Windows. We want Windows line-endings, most of the files are, but some have developed UNIX line-endings (which we don't want). We don't want to change all of the files - only the ones that are incorrect. So, I want a simple algorithm to run on Windows, that will read the first line of a file and tell me what the line-ending is. The following code seems to report UNIX line-endings in all cases - even when they are Windows. Please help. 
my $cr = chr(0x0d);
my $lf = chr(0x0a);
my $infile = "test.txt";
open (IN, "<$infile") or die "Couldn't open input file: $!";
my $first_line = <IN>;
my ($line_text, $line_ending) = ($first_line =~ /(.*)(\015|\012|\015\0
+12)/);
# detect line ending type
if ($line_ending eq "$cr$lf") {
  print "Windows line ending\n";
} elsif ($line_ending eq "$lf") {
  print "UNIX line ending\n";
} elsif ($line_ending eq "$cr") {
  print "Mac line ending\n";
} else {
  print "Unknown line ending\n";
  }
close (IN);

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In reply to How to Detect Mixed File Line-Endings by paul-s-

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