Hello lbrandewie, and welcome to the Monastery!

Have a look at perlport#Newlines. \n is Perl’s logical newline, so when reading from a file on the Windows platform, the 2-character sequence \x0D\x0A (represented here in hexadecimal) is translated to \n; and when writing to a file, \n is translated to \x0D\x0A.

If you want to distinguish between \x0A (Unix) and \x0D\x0A (Windows) in your input files, then you can read using the :raw layer:

use strict;
use warnings;
use autodie;

my $file = '1977_SoPW.txt';

open(my $fh, '<:raw', $file);
my @test = <$fh>;
close $fh;

for my $line (@test)
{
    print ord(substr($line, -2, 1)), "\t";
    print ord(substr($line, -1, 1)), "\n";
}

print "\n";

[download]

Output (where the input file “1977_SoPW.txt” contains 3 sentences, the first and third terminated by \x0D\x0A, the second by just \x0A):

16:51 >perl 1977_SoPW.pl
13      10
46      10
13      10


16:51 >

[download]

(46 is the decimal code for ASCII character ., the full stop or period, which happened to be the last text character in the line.)

On the other hand, if you want to distinguish between different newline representations in your code, then you should either use literal rather than logical characters:

my $test = "\x0D\x0A\x0D\x0A\x0D\x0A\x0D\x0A\x0D\x0A";

[download]

or add \r as haukex says above:

my $test = "\r\n\r\n\r\n\r\n\r\n";

[download]

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: Perl to C problem by Athanasius
in thread Perl to C problem by lbrandewie

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.