70 lines
4.3 KiB
Plaintext
70 lines
4.3 KiB
Plaintext
# -*- mode: rdoc; coding: utf-8; fill-column: 74; -*-
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== Pre-defined global variables
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$!:: The Exception object set by Kernel#raise.
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$@:: The same as <code>$!.backtrace</code>.
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$~:: The information about the last match in the current scope (thread-local and frame-local).
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$&:: The string matched by the last successful match.
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$`:: The string to the left of the last successful match.
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$':: The string to the right of the last successful match.
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$+:: The highest group matched by the last successful match.
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$1:: The Nth group of the last successful match. May be > 1.
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$=:: This variable is no longer effective. Deprecated.
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$/:: The input record separator, newline by default. Aliased to $-0.
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$\:: The output record separator for Kernel#print and IO#write. Default is +nil+.
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$,:: The output field separator for Kernel#print and Array#join. Non-nil $, will be deprecated.
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$;:: The default separator for String#split. Non-nil $; will be deprecated. Aliased to $-F.
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$.:: The current input line number of the last file that was read.
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$<:: The same as ARGF.
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$>:: The default output stream for Kernel#print and Kernel#printf. $stdout by default.
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$_:: The last input line of string by gets or readline.
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$0:: Contains the name of the script being executed. May be assignable.
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$*:: The same as ARGV.
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$$:: The process number of the Ruby running this script. Same as Process.pid.
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$?:: The status of the last executed child process (thread-local).
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$LOAD_PATH:: Load path for searching Ruby scripts and extension libraries used
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by Kernel#load and Kernel#require. Aliased to $: and $-I.
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Has a singleton method <code>$LOAD_PATH.resolve_feature_path(feature)</code>
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that returns [+:rb+ or +:so+, path], which resolves the feature to
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the path the original Kernel#require method would load.
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$LOADED_FEATURES:: The array contains the module names loaded by require.
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Aliased to $".
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$DEBUG:: The debug flag, which is set by the <tt>-d</tt> switch. Enabling debug
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output prints each exception raised to $stderr (but not its
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backtrace). Setting this to a true value enables debug output as
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if <tt>-d</tt> were given on the command line. Setting this to a false
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value disables debug output. Aliased to $-d.
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$FILENAME:: Current input filename from ARGF. Same as ARGF.filename.
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$stderr:: The current standard error output.
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$stdin:: The current standard input.
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$stdout:: The current standard output.
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$VERBOSE:: The verbose flag, which is set by the <tt>-w</tt> or <tt>-v</tt> switch.
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Setting this to a true value enables warnings as if <tt>-w</tt> or <tt>-v</tt> were given
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on the command line. Setting this to +nil+ disables warnings,
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including from Kernel#warn. Aliased to $-v and $-w.
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$-a:: True if option <tt>-a</tt> is set. Read-only variable.
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$-i:: In in-place-edit mode, this variable holds the extension, otherwise +nil+.
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$-l:: True if option <tt>-l</tt> is set. Read-only variable.
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$-p:: True if option <tt>-p</tt> is set. Read-only variable.
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== Pre-defined global constants
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STDIN:: The standard input. The default value for $stdin.
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STDOUT:: The standard output. The default value for $stdout.
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STDERR:: The standard error output. The default value for $stderr.
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ENV:: The hash contains current environment variables.
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ARGF:: The virtual concatenation of the files given on command line (or from $stdin if no files were given).
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ARGV:: An Array of command line arguments given for the script.
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DATA:: The file object of the script, pointing just after <code>__END__</code>.
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TOPLEVEL_BINDING:: The Binding of the top level scope.
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RUBY_VERSION:: The Ruby language version.
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RUBY_RELEASE_DATE:: The release date string.
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RUBY_PLATFORM:: The platform identifier.
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RUBY_PATCHLEVEL:: The patchlevel for this Ruby. If this is a development build of Ruby the patchlevel will be -1.
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RUBY_REVISION:: The GIT commit hash for this Ruby.
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RUBY_COPYRIGHT:: The copyright string for Ruby.
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RUBY_ENGINE:: The name of the Ruby implementation.
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RUBY_ENGINE_VERSION:: The version of the Ruby implementation.
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RUBY_DESCRIPTION:: The same as <tt>ruby --version</tt>, a String describing various aspects of the Ruby implementation.
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