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              Ruby 官方文檔

              Resource

              Related

              Bignum

              Bignum

              Complex

              Float

              Fixnum

              Fixnum

              Proc

              Random

              Rational

              Rational

              Symbol

              Pre-defined

              Variables

              • $`
              • The string to the left of the last successful match.
              • $_
              • The last input line of string by gets or readline.
              • $-0
              • The alias to $/
              • $-a
              • True if option -a is set. Read-only variable.
              • $-d
              • The alias to $DEBUG.
              • $-F
              • The alias to $;.
              • $-i
              • In in-place-edit mode, this variable holds the extention, otherwise nil.
              • $-l
              • True if option -l is set. Read-only variable.
              • $-p
              • True if option -p is set. Read-only variable.
              • $-v
              • The alias to $VERBOSE.
              • $,
              • The output field separator for the print and Array#join.
              • $;
              • The default separator for String#split.
              • $:
              • Load path for scripts and binary modules by load or require.
              • $!
              • The exception information message set by ‘raise’.
              • $?
              • The status of the last executed child process.
              • $.
              • The current input line number of the last file that was read.
              • $'
              • The string to the right of the last successful match.
              • $"
              • The array contains the module names loaded by require.
              • $@
              • Array of backtrace of the last exception thrown.
              • $*
              • Command line arguments given for the script sans args.
              • $/
              • The input record separator, newline by default.
              • $\
              • The output record separator for the print and IO#write. Default is nil.
              • $&
              • The string matched by the last successful pattern match in this scope.
              • $>
              • The default output for print, printf. $stdout by default.
              • $<
              • The virtual concatenation file of the files given on command line.
              • $+
              • The last bracket matched by the last successful match.
              • $=
              • The flag for case insensitive, nil by default.
              • $~
              • The information about the last match in the current scope.
              • $$
              • The process number of the Ruby running this script.
              • $0
              • Contains the name of the script being executed. May be assignable.
              • $1
              • The Nth group of the last successful match. May be > 1.
              • $DEBUG
              • The status of the -d switch.
              • $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 -v switch.

              Global Constant

              • ARGV
              • The alias to the $*.
              • DATA
              • The file object of the script, pointing just after __END__.
              • ENV
              • The hash contains current environment variables.
              • FALSE
              • The false itself.
              • NIL
              • The nil itself.
              • RUBY_PLATFORM
              • The platform identifier
              • RUBY_RELEASE_DATE
              • The relase date string.
              • RUBY_VERSION
              • The ruby version string (VERSION was depricated).
              • STDERR
              • The standard error output. The default value for $stderr.
              • STDIN
              • The standard input. The default value for $stdin.
              • STDOUT
              • The standard output. The default value for $stdout.
              • TRUE
              • The typical true value.
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