IOSET

@IOSET  This command can be used to set an I/O-device in a given state.

identifies a device, which must be reserved (opened) beforehand.

 is 0 (zero) for input part and 1 (one) for output part (of device).

must be 0 (zero).

has different meaning for different devices but generally -1 means "reset device". See also.