Hi deathmetalscottie,

Make sure that you have a name defined for the <select> tag. In your code,you're using "$key", which you never define: 

my $key;

  ...

<select name="$key" size="15" multiple="multiple">

[download]
So if you fix that, for example, calling it "multi": 
my $name = "multi";  # Renamed from $key to be less confusing

# Sorry, I don't want to show my /etc/password :)
my %user = (
    'fred'     => 101,
    'barney'   => 102,
    'wilma'    => 103,
    'betty'    => 104,
    'pebbles'  => 105,
    'bambam'   => 106,
);

...
<select name="$name" size="15" multiple="multiple">

foreach my $key(sort keys %user) {
    my $val = $user{$key};
    if ($val > 100) {
        print qq{<option value="$key">$key ($val)</option><br />};
    }
}

[download]
Then you can see with a quick test which names were chosen, in sum.cgi, like this: 
#!/usr/bin/perl

use strict;
use warnings;
use CGI qw/:standard/;
use CGI::Carp qw/fatalsToBrowser/;
use Data::Dumper;

my @users = param('multi');
die sprintf "Users selected:  %s\n", Dumper(\@users);

[download]
For example, selecting the 2 values "bambam (106)" and "pebbles (105)": 
*** bambam (106) ****
    barney (102)
    betty (104)
    fred (101)
*** pebbles (105) ***
    wilma (103)

[download]
and clicking "Go!" to call sum.cgi should show: 
Software error:

Users selected:  $VAR1 = [
          'betty',
          'wilma'
        ];

[download]
say  substr+lc crypt(qw $i3 SI$),4,5

In reply to Re: Passing variable to another CGI.pm program by golux
in thread Passing variable to another CGI.pm program by deathmetalscottie

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.