I've got a quite obscure problem concerning linewise parsing of files within my huge project.

Isolated problem:

• I've got a simple file, containing two lines "A\nB\n"
• I parse this file using the following:

  open( F, $file ) || die "Can't open $file - $!";
  while (<F>) {
    print $_;
    next;
  }
  [download]

Runnig this example standalone, everything works fine:

• the file is processed line by line
• $_ changes its value each iteration.
• There are two iterations, as the file has two lines

I do have almost the same code within a huge project. Running this code on the same file does not show the same behaviour within my project:

• File is opened correctly
• ...but there is only one iteration
• Introspecting into $_ shows, that the whole file is read as one line, showing an obscure separator betweeen "A" and "B" (something like "A|B").

What's going wrong? It used to work formerly - I made a couple of changes "far away" fom this code sequence within my project.

What may perl cause to ignore the CarriageReturn during parsing with while <F>? How can I "force" perl to use carriageReturn as line separator?

???Puzzled???
Hoppfrosch