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--- !ruby/object:RI::ClassDescription 
attributes: []

class_methods: []

comment: 
- !ruby/struct:SM::Flow::P 
  body: Class <tt>IO</tt> is the basis for all input and output in Ruby. An I/O stream may be <em>duplexed</em> (that is, bidirectional), and so may use more than one native operating system stream.
- !ruby/struct:SM::Flow::P 
  body: Many of the examples in this section use class <tt>File</tt>, the only standard subclass of <tt>IO</tt>. The two classes are closely associated.
- !ruby/struct:SM::Flow::P 
  body: As used in this section, <em>portname</em> may take any of the following forms.
- !ruby/object:SM::Flow::LIST 
  contents: 
  - !ruby/struct:SM::Flow::LI 
    label: "*"
    body: A plain string represents a filename suitable for the underlying operating system.
  - !ruby/struct:SM::Flow::LI 
    label: "*"
    body: A string starting with ``<tt>|</tt>'' indicates a subprocess. The remainder of the string following the ``<tt>|</tt>'' is invoked as a process with appropriate input/output channels connected to it.
  - !ruby/struct:SM::Flow::LI 
    label: "*"
    body: A string equal to ``<tt>|-</tt>'' will create another Ruby instance as a subprocess.
  type: :BULLET
- !ruby/struct:SM::Flow::P 
  body: "Ruby will convert pathnames between different operating system conventions if possible. For instance, on a Windows system the filename ``<tt>/gumby/ruby/test.rb</tt>'' will be opened as ``<tt>\\gumby\\ruby\\test.rb</tt>''. When specifying a Windows-style filename in a Ruby string, remember to escape the backslashes:"
- !ruby/struct:SM::Flow::VERB 
  body: "   &quot;c:\\gumby\\ruby\\test.rb&quot;\n"
- !ruby/struct:SM::Flow::P 
  body: Our examples here will use the Unix-style forward slashes; <tt>File::SEPARATOR</tt> can be used to get the platform-specific separator character.
- !ruby/struct:SM::Flow::P 
  body: I/O ports may be opened in any one of several different modes, which are shown in this section as <em>mode</em>. The mode may either be a Fixnum or a String. If numeric, it should be one of the operating system specific constants (O_RDONLY, O_WRONLY, O_RDWR, O_APPEND and so on). See man open(2) for more information.
- !ruby/struct:SM::Flow::P 
  body: If the mode is given as a String, it must be one of the values listed in the following table.
- !ruby/struct:SM::Flow::VERB 
  body: "  Mode |  Meaning\n  -----+--------------------------------------------------------\n  &quot;r&quot;  |  Read-only, starts at beginning of file  (default mode).\n  -----+--------------------------------------------------------\n  &quot;r+&quot; |  Read-write, starts at beginning of file.\n  -----+--------------------------------------------------------\n  &quot;w&quot;  |  Write-only, truncates existing file\n       |  to zero length or creates a new file for writing.\n  -----+--------------------------------------------------------\n  &quot;w+&quot; |  Read-write, truncates existing file to zero length\n       |  or creates a new file for reading and writing.\n  -----+--------------------------------------------------------\n  &quot;a&quot;  |  Write-only, starts at end of file if file exists,\n       |  otherwise creates a new file for writing.\n  -----+--------------------------------------------------------\n  &quot;a+&quot; |  Read-write, starts at end of file if file exists,\n       |  otherwise creates a new file for reading and\n       |  writing.\n  -----+--------------------------------------------------------\n   &quot;b&quot; |  (DOS/Windows only) Binary file mode (may appear with\n       |  any of the key letters listed above).\n"
- !ruby/struct:SM::Flow::P 
  body: The global constant ARGF (also accessible as $&lt;) provides an IO-like stream which allows access to all files mentioned on the command line (or STDIN if no files are mentioned). ARGF provides the methods <tt>#path</tt> and <tt>#filename</tt> to access the name of the file currently being read.
constants: []

full_name: IOError
includes: []

instance_methods: []

name: IOError
superclass: StandardError