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# -*- mode: rdoc; coding: utf-8; fill-column: 74; -*-
== Pre-defined variables
$!:: The exception information message set by 'raise'.
$@:: Array of backtrace of the last exception thrown.
$&:: The string matched by the last successful match.
$`:: The string to the left of the last successful match.
$':: The string to the right of the last successful match.
$+:: The highest group matched by the last successful match.
$1:: The Nth group of the last successful match. May be > 1.
$~:: The information about the last match in the current scope.
$=:: The flag for case insensitive, nil by default.
$/:: The input record separator, newline by default.
$\:: The output record separator for the print and IO#write. Default is nil.
$,:: The output field separator for the print and Array#join.
$;:: The default separator for String#split.
$.:: The current input line number of the last file that was read.
$<:: The virtual concatenation file of the files given on command line (or from $stdin if no files were given).
$>:: The default output for print, printf. $stdout by default.
$_:: The last input line of string by gets or readline.
$0:: Contains the name of the script being executed. May be assignable.
$*:: Command line arguments given for the script sans args.
$$:: The process number of the Ruby running this script.
$?:: The status of the last executed child process. This value is
$::: Load path for scripts and binary modules by load or require.
$":: The array contains the module names loaded by require.
$DEBUG:: The debug flag, which is set by the -d switch. Enabling debug
output prints each exception raised to $stderr (but not its
backtrace). Setting this to a true value enables debug output as
if -d were given on the command line. Setting this to a false
value disables debug output.
$FILENAME:: Current input file from $<. Same as $<.filename.
$LOAD_PATH:: The alias to the $:.
$stderr:: The current standard error output.
$stdin:: The current standard input.
$stdout:: The current standard output.
$VERBOSE:: The verbose flag, which is set by the -w or -v switch. Setting
this to a true value enables warnings as if -w or -v were given
on the command line. Setting this to nil disables warnings,
including from Kernel#warn.
$-0:: The alias to $/.
$-a:: True if option -a is set. Read-only variable.
$-d:: The alias of $DEBUG. See $DEBUG above for further discusison.
$-F:: The alias to $;.
$-i:: In in-place-edit mode, this variable holds the extension, otherwise nil.
$-I:: The alias to $:.
$-l:: True if option -l is set. Read-only variable.
$-p:: True if option -p is set. Read-only variable.
$-v:: An alias of $VERBOSE. See $VERBOSE above for further discussion.
$-w:: An alias of $VERBOSE. See $VERBOSE above for further discussion.
== Pre-defined global constants
TRUE:: The typical true value.
FALSE:: The false itself.
NIL:: The nil itself.
STDIN:: The standard input. The default value for $stdin.
STDOUT:: The standard output. The default value for $stdout.
STDERR:: The standard error output. The default value for $stderr.
ENV:: The hash contains current environment variables.
ARGF:: The alias to the $<.
ARGV:: The alias to the $*.
DATA:: The file object of the script, pointing just after __END__.
RUBY_VERSION:: The ruby version string (VERSION was deprecated).
RUBY_RELEASE_DATE:: The release date string.
RUBY_PLATFORM:: The platform identifier.