Let's clean up your code a little bit, too:

#!/usr/bin/perl -w
use strict;
my @myarray=('a'..'z','A'..'Z','1'..'9');
my $mysamplepass;

for (1..8) {
 $mysamplepass .= $myarray[rand(@myarray)];
}
print $mysamplepass;
[download]

Notes:

• The .. operator lets you specificy a range.
• The .= is shorthand for concatenation. Similar shorthands are += and -= (though there are others). $x = $x + 3 is functionally equivalent to $x += 3.
• I've included upper-case characters in the range as they dramatically increase security on passwords by increasing possible permutations.

Hope this helps! Let me know if you have any questions.

Cheers,
Ovid

Update: Aargh!!! jlistf touched on most of these points while I was composing this. I need to type faster :(

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