You are using split() to split a line into three parts. The error message tells you that $freq has the undefined value, which is what happens if there are not enough parts to split the line into. The error message also tells you that this happens with line 1 (i.e. the first line) of the file you are reading. So presumably line 1 of the file has only one ' ' and therefore only two parts.

When something like this happens, it is useful to add a line "use Data::Dumper;" to the beginning of your script and a line like "print Dumper(\$line,\$header,\$tag,\$freq);" inside your loop. Start the script and look at the first line. This will help you in debugging even more complicated bugs

In reply to Re: Error message "Use of uninit" by jethro
in thread Error message "Use of uninit" by bluray

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.