Hi, all. Pretty new at this, but I'm trying to build a hash table where the values are pointers to arrays. The code below is my pathetic attempt to say, "if the user is not already in the array indexed by that machine name, add him." 

if (!grep (/.*$uname.*/, @{$machinearray{$machine}})) {
    ${$machinearray{$machine}}[$#{machinearray{$machine}}] = $pwline;
}

[download]

The error I get is Can't use subscript on array length at ./gendist line 41, near "$machine}"

Incidentally, the second line is #41. Anyone who'd care to explain what I'm doing wrong will be my personal hero.

In reply to Hash table of arrays by Grumpy

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.