plsfnam: Set output file name

The PLplot Plotting Library: Programmer's Reference Manual
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### `plsfnam`: Set output file name

`plsfnam` (fnam);

Sets the current output file name, if applicable. If the file name has not been specified and is required by the driver, the user will be prompted for it. If using the X-windows output driver, this sets the display name. This routine, if used, must be called before initializing PLplot.

`fnam` (`const char *`, input) Pointer to file name string.

Redacted form: `plsfnam(fnam)`

This function is used in examples 1,20.

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