if ($resnum1=$resnum)

Inside the brackets is an assignment. You almost certainly don't want to do that but instead test equality. ie:

if ($resnum1 == $resnum)

[download]

== is for comparing numbers and eq is for comparing strings.

Is there any particular reason you use those massive regexes in preference to a simple split? That might make things a little clearer. Other tips: use strict and warnings, replace print ... exit with die and try to use consistent indenting to make your code more legible (this really does help).

Good luck.

In reply to Re: Perl script that will read two pdb files with different line numbers and will replace the chain letter from the first to the second file by hippo
in thread Perl script that will read two pdb files with different line numbers and will replace the chain letter from the first to the second file by Nastazia

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.