plgfnam: Get output file name

`plgfnam`: Get output file name
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#### `plgfnam`: Get output file name

`plgfnam (` | fnam`)`;

Gets the current output file name, if applicable.

`fnam` (``PLCHAR_NC_VECTOR``, output)

  Returned ascii character string (with preallocated length of 80 characters or more) containing the file name.

Redacted form: `plgfnam(fnam)`

This function is used in example 31.

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