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  1. or download this
    BEGIN {
  *CORE::GLOBAL::ucfirst = sub {
...
$_ = "I shouldn't be printing this, but I am anyway.";
my $var = undef;
print ucfirst $var;
  2. or download this
    BEGIN {
  *CORE::GLOBAL::ucfirst = sub {
     join ' ', map CORE::ucfirst, split / /, @_ ? $_[0] : $_;
  }
}