what I need to do is add to the end of each line in the temp file the value $sequenceValue.
You can't do that by opening a file for reading and writing, and processing the file line by line. If you read a line, increase its length, and write it back, you will have (partially) overwriten the next line. The file system has no concept at all of lines. Files are just sequences of bytes.
another problem Im having is althogh I use "seek" when reding the file I get the second line and not the first. thanks.
That's because you read in the first line with <TEMPFILE>, discard its result, and then read something with read.

Abigail


In reply to Re: how to read and write at the same time + a problem with seek by Abigail-II
in thread how to read and write at the same time + a problem with seek by wolffm

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.