## 12.5.2 ACTION Specifier

The ACTION specifier asks which I/O operations are allowed for a file. It takes the following form:

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

  'READ' | If the file is connected for input only
  'WRITE' | If the file is connected for output only
  'READWRITE' | If the file is connected for both input and output
  'UNDEFINED' | If the file is not connected

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