hossman@slate:~/tmp/9780596004927/programming_perl_examples [master] $ perl ./program_listings/ch10/ch10.002.pl
 is defined
$ is defined
$" is defined
$/ is defined
$0 is defined
$@ is defined
%CORE:: is nonnull
%DynaLoader:: is nonnull
%ENV is nonnull
@INC is nonnull
%IO:: is nonnull
%Internals:: is nonnull
%PerlIO:: is nonnull
%Regexp:: is nonnull
%UNIVERSAL:: is nonnull
%constant:: is nonnull
%main:: is nonnull
%mro:: is nonnull
%re:: is nonnull
$symname is defined
%utf8:: is nonnull
%version:: is nonnull