I might have seen it if I'd have found this post ....doh.

Just incase you were wondering why.....

Single quotes stop scalars/hashes/arrays etc....being interpreted.

So....

my $var = 'HELLO';

print '$var';

....would print $var......but

print "$var";

....would print HELLO as would:

print $var;

It's the same with hashes.....

%hash = (HELLO => 'GOODBYE');

$hash{$var} would print GOODBYE, but $hash{'$var'} would not exist so it would print nothing.