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<h3>Table of Contents</h3>
<ul class="link-list" role="directory">
<li><a href="#label-Pre-defined+global+variables">Pre-defined global variables</a>
<li><a href="#label-Pre-defined+global+constants">Pre-defined global constants</a>
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<h2 id="label-Pre-defined+global+variables">Pre-defined global variables<span><a href="#label-Pre-defined+global+variables">¶</a> <a href="#top">↑</a></span></h2>
<dl class="rdoc-list note-list"><dt>$!
<dd>
<p>The <a href="Exception.html"><code>Exception</code></a> object set by <a href="Kernel.html#method-i-raise"><code>Kernel#raise</code></a>.</p>
</dd><dt>$@
<dd>
<p>The same as <code>$!.backtrace</code>.</p>
</dd><dt>$~
<dd>
<p>The information about the last match in the current scope (thread-local and frame-local).</p>
</dd><dt>$&
<dd>
<p>The string matched by the last successful match.</p>
</dd><dt>$`
<dd>
<p>The string to the left of the last successful match.</p>
</dd><dt>$'
<dd>
<p>The string to the right of the last successful match.</p>
</dd><dt>$+
<dd>
<p>The highest group matched by the last successful match.</p>
</dd><dt>$1
<dd>
<p>The Nth group of the last successful match. May be > 1.</p>
</dd><dt>$=
<dd>
<p>This variable is no longer effective. Deprecated.</p>
</dd><dt>$/
<dd>
<p>The input record separator, newline by default. Aliased to $-0.</p>
</dd><dt>$\
<dd>
<p>The output record separator for <a href="Kernel.html#method-i-print"><code>Kernel#print</code></a> and <a href="IO.html#method-i-write"><code>IO#write</code></a>. Default is <code>nil</code>.</p>
</dd><dt>$,
<dd>
<p>The output field separator for <a href="Kernel.html#method-i-print"><code>Kernel#print</code></a> and <a href="Array.html#method-i-join"><code>Array#join</code></a>. Non-nil $, will be deprecated.</p>
</dd><dt>$;
<dd>
<p>The default separator for <a href="String.html#method-i-split"><code>String#split</code></a>. Non-nil $; will be deprecated. Aliased to $-F.</p>
</dd><dt>$.
<dd>
<p>The current input line number of the last file that was read.</p>
</dd><dt>$<
<dd>
<p>The same as <a href="ARGF.html"><code>ARGF</code></a>.</p>
</dd><dt>$>
<dd>
<p>The default output stream for <a href="Kernel.html#method-i-print"><code>Kernel#print</code></a> and <a href="Kernel.html#method-i-printf"><code>Kernel#printf</code></a>. $stdout by default.</p>
</dd><dt>$_
<dd>
<p>The last input line of string by gets or readline.</p>
</dd><dt>$0
<dd>
<p>Contains the name of the script being executed. May be assignable.</p>
</dd><dt>$*
<dd>
<p>The same as ARGV.</p>
</dd><dt>$$
<dd>
<p>The process number of the Ruby running this script. Same as <a href="Process.html#method-c-pid"><code>Process.pid</code></a>.</p>
</dd><dt>$?
<dd>
<p>The status of the last executed child process (thread-local).</p>
</dd><dt>$LOAD_PATH
<dd>
<p>Load path for searching Ruby scripts and extension libraries used by <a href="Kernel.html#method-i-load"><code>Kernel#load</code></a> and <a href="Kernel.html#method-i-require"><code>Kernel#require</code></a>. Aliased to $: and $-I. Has a singleton method <code>$LOAD_PATH.resolve_feature_path(feature)</code> that returns [<code>:rb</code> or <code>:so</code>, path], which resolves the feature to the path the original <a href="Kernel.html#method-i-require"><code>Kernel#require</code></a> method would load.</p>
</dd><dt>$LOADED_FEATURES
<dd>
<p>The array contains the module names loaded by require. Aliased to $“.</p>
</dd><dt>$DEBUG
<dd>
<p>The debug flag, which is set by the <code>-d</code> 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 <code>-d</code> were given on the command line. Setting this to a false value disables debug output. Aliased to $-d.</p>
</dd><dt>$FILENAME
<dd>
<p>Current input filename from <a href="ARGF.html"><code>ARGF</code></a>. Same as <a href="ARGF.html#method-i-filename"><code>ARGF.filename</code></a>.</p>
</dd><dt>$stderr
<dd>
<p>The current standard error output.</p>
</dd><dt>$stdin
<dd>
<p>The current standard input.</p>
</dd><dt>$stdout
<dd>
<p>The current standard output.</p>
</dd><dt>$VERBOSE
<dd>
<p>The verbose flag, which is set by the <code>-w</code> or <code>-v</code> switch. Setting this to a true value enables warnings as if <code>-w</code> or <code>-v</code> were given on the command line. Setting this to <code>nil</code> disables warnings, including from <a href="Kernel.html#method-i-warn"><code>Kernel#warn</code></a>. Aliased to $-v and $-w.</p>
</dd><dt>$-a
<dd>
<p>True if option <code>-a</code> is set. Read-only variable.</p>
</dd><dt>$-i
<dd>
<p>In in-place-edit mode, this variable holds the extension, otherwise <code>nil</code>.</p>
</dd><dt>$-l
<dd>
<p>True if option <code>-l</code> is set. Read-only variable.</p>
</dd><dt>$-p
<dd>
<p>True if option <code>-p</code> is set. Read-only variable.</p>
</dd></dl>
<h2 id="label-Pre-defined+global+constants">Pre-defined global constants<span><a href="#label-Pre-defined+global+constants">¶</a> <a href="#top">↑</a></span></h2>
<dl class="rdoc-list note-list"><dt>TRUE
<dd>
<p>The typical true value. Deprecated.</p>
</dd><dt>FALSE
<dd>
<p>The <code>false</code> itself. Deprecated.</p>
</dd><dt>NIL
<dd>
<p>The <code>nil</code> itself. Deprecated.</p>
</dd><dt>STDIN
<dd>
<p>The standard input. The default value for $stdin.</p>
</dd><dt>STDOUT
<dd>
<p>The standard output. The default value for $stdout.</p>
</dd><dt>STDERR
<dd>
<p>The standard error output. The default value for $stderr.</p>
</dd><dt><a href="ENV.html"><code>ENV</code></a>
<dd>
<p>The hash contains current environment variables.</p>
</dd><dt><a href="ARGF.html"><code>ARGF</code></a>
<dd>
<p>The virtual concatenation of the files given on command line (or from $stdin if no files were given).</p>
</dd><dt>ARGV
<dd>
<p>An <a href="Array.html"><code>Array</code></a> of command line arguments given for the script.</p>
</dd><dt>DATA
<dd>
<p>The file object of the script, pointing just after <code>__END__</code>.</p>
</dd><dt>TOPLEVEL_BINDING
<dd>
<p>The <a href="Binding.html"><code>Binding</code></a> of the top level scope.</p>
</dd><dt>RUBY_VERSION
<dd>
<p>The Ruby language version.</p>
</dd><dt>RUBY_RELEASE_DATE
<dd>
<p>The release date string.</p>
</dd><dt>RUBY_PLATFORM
<dd>
<p>The platform identifier.</p>
</dd><dt>RUBY_PATCHLEVEL
<dd>
<p>The patchlevel for this Ruby. If this is a development build of Ruby the patchlevel will be -1.</p>
</dd><dt>RUBY_REVISION
<dd>
<p>The GIT commit hash for this Ruby.</p>
</dd><dt>RUBY_COPYRIGHT
<dd>
<p>The copyright string for Ruby.</p>
</dd><dt>RUBY_ENGINE
<dd>
<p>The name of the Ruby implementation.</p>
</dd><dt>RUBY_ENGINE_VERSION
<dd>
<p>The version of the Ruby implementation.</p>
</dd><dt>RUBY_DESCRIPTION
<dd>
<p>The same as <code>ruby --version</code>, a <a href="String.html"><code>String</code></a> describing various aspects of the Ruby implementation.</p>
</dd></dl>
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