plgfnam: Get output file name

The PLplot Plotting Library: Programmer's Reference Manual
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### `plgfnam`: Get output file name

`plgfnam` (fnam);

Gets the current output file name, if applicable.

`fnam` (`char *`, output) Pointer to file name string (a preallocated string of 80 characters or more).

Redacted form: `plgfnam(fnam)`

This function is not used in any examples.

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