Can someone shorten this upper routine?

sub toUpper
{ my $z = shift;
 $z =~ tr/a-z/A-Z/;
 return $z;
}

Also in a slightly different scenario, how can i change the value of the
parameter itself with a sub.

$a="ca";
toUpper($a);  #change the $a value itself
print $a;      #I want it to print "CA"


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