Your input data probably contains an extra \r that is not removed by chomp. You can see that with Data::Dump: 

use Data::Dump qw( pp );
# some code here
print pp \@ip;
chomp(@ip);
print pp \@ip;

[download]
One of the ways this can happen is when you try to read a file created on Windows with perl running on Linux, or a Cygwin perl.

You can correct that by explicitly setting the input record separator to the CRLF format: 

my @ip;
{  
  local $/ = "\r\n"; # because this is local, the normal behaviour is 
+restored after this block
  open my $dat, "<", $in_file or die "Can't open file $in_file: $!";
  @ip = <$dat>;
  chomp(@ip);
  close $dat;
}

[download]

In reply to Re: problem in printing the result in the out put file by Eily
in thread problem in printing the result in the out put file by hegaa

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.