plgstrm: Get current stream number

The PLplot Plotting Library: Programmer's Reference Manual
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### `plgstrm`: Get current stream number

`plgstrm` (strm);

Gets the number of the current output stream. See also `plsstrm`.

`strm` (`PLINT *`, output) Pointer to current stream value.

Redacted form: `plgstrm(strm)`

This function is used in example 1,20.

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