in reply to Perl and arrays of arrays?

Of course, the documentation (perldoc perllol) will give a bit more information, but what you're looking for is quick: 
$ip0 = $masterarray[0][0];
push(@{$masterarray[0]}, 'alias8');

[download]

--
[ e d @ h a l l e y . c c ]

In Section Seekers of Perl Wisdom