$!
$"
$$
$&
$'
$*
$+
$,
$-0
$-F
$-I
$-K
$-a
$-d
$-i
$-l
$-p
$-v
$-w
$.
$/
$0
$1
$10
$11
$2
$3
$4
$5
$6
$7
$8
$9
$:
$;
$<
$=
$>
$?
$@
$DEBUG
$FILENAME
$KCODE
$LOADED_FEATURES
$LOAD_PATH
$PROGRAM_NAME
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$VERBOSE
$\
$_
$`
$deferr
$defout
$stderr
$stdin
$stdout
$~
ARGF
ARGV
Array
BEGIN
DATA
END
ENV
FALSE
Float
Integer
NIL
PLATFORM
RELEASE_DATE
RUBY_COPYRIGHT
RUBY_DESCRIPTION
RUBY_PATCHLEVEL
RUBY_PLATFORM
RUBY_RELEASE_DATE
RUBY_VERSION
SCRIPT_LINES__
STDERR
STDIN
STDOUT
String
TOPLEVEL_BINDING
TRUE
VERSION
__method__
`
abort
alias
and
at_exit
autoload
autoload?
begin
binding
block_given
break
callcc
caller
case
catch
chomp
chomp!
chop
chop
class
def
defined?
do
else
elsif
end
ensure
eval
exec
exit
exit!
fail
false
for
fork
format
getc
gets
global_variables
gsub
gsub!
if
in
iterator?
lambda
load
local_variables
loop
module
next
nil
not
open
or
p
printf
proc
putc
puts
raise
rand
readline
readlines
redo
require
require_relative
rescue
retry
return
scan
select
self
set_trace_func
sleep
split
sprintf
srand
sub
sub!
super
syscall
system
test
then
throw
trace_var
trap
true
undef
unless
until
untrace_var
warn
when
while
yield