$EXTENDED_OS_ERROR

$SYSTEM_FD_MAX

$^D The current value of the debugging flags. May be read or set. Like its command-line equivalent, you can use numeric or symbolic values

$ERRNO

$\ The output record separator for the print operator. If defined, this value is printed after the last of print's arguments. Default is

$COMPILING

$PERL_VERSION

$GID

$ORS

%! Each element of %! has a true value only if $!