## 13.5.24 READ Specifier

The READ specifier asks whether a file can be read. It takes the following form:

  READ = rd
  rd
  Is a scalar default character variable that is assigned one of the following values:

  'YES' | If the file can be read
  'NO' | If the file cannot be read
  'UNKNOWN' | If the processor cannot determine whether the file can be read

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