## 12.5.10 EXIST Specifier

The EXIST specifier asks whether a file exists and can be opened. It takes the following form:

  EXIST = ex
  ex
  Is a scalar default logical variable that is assigned one of the following values:

  .TRUE. | If the specified file exists and can be opened, or if the specified unit exists
  .FALSE. | If the specified file or unit does not exist or if the file exists but cannot be opened

The unit exists if it is a number in the range allowed by the processor.

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