$EXTENDED_OS_ERROR
$ORS
$PERL_VERSION
$^F The maximum system file descriptor, ordinarily 2. System file descriptors are passed to
@ARGV The array @ARGV contains the command-line arguments intended for the script.
${^RE_DEBUG_FLAGS} The current value of the regex debugging flags. Set to 0 for no debug output even when the re
%! Each element of %! has a true value only if $!
$, The output field separator for the print operator. If defined, this value is printed between each of print's arguments. Default is
%ENV The hash %ENV contains your current environment. Setting a value in
$^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
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