## 10.5.7 EXIST Specifier

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

    EXIST = ex

ex
  Is a logical scalar memory reference that is assigned one of the following values:

  - .TRUE.: If the specified file exists and can be opened or if the 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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