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my %required;
$required{path} = ($ENV{HTTP_HOST} eq 'www.shrum.net') ? 
                  'g:/websites/shrum.net/' : 'd:/users/http/html/';

my %required;
if ($ENV{HTTP_HOST} eq 'www.shrum.net') { # We now know which 
...
    $required{path}         = 'd:/users/http/html/';
    $required{someotherkey} = 'some different string';
}