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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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