I am by no means an expert, but my advice is always, search the site before posting already answered questions. But seeing how you posted as an anonymous monk, it is clear you are ashamed. anyway what you're doing wrong, is trying to open a file that doesn't exist for reading. You need to open it for writing first, which should create the file. something like this: 
#!/usr/bin/perl
$Inputfile='filename';
open (OUT, ">$inputfile.out") or
       die "cannot open file 4 writing: $!\n";

open (IN,"<$Inputfile") or die "cannot open file: $!\n";

while (<IN>){
....
.....
print OUT;  #print to $Inputfile.out file
}

[download]

"cRaZy is co01, but sometimes cRaZy is cRaZy".
                                                      - crazyinsomniac

In reply to (crazyinsomniac) Re: Creating file at run time by crazyinsomniac
in thread Creating file at run time by Anonymous Monk

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.