put(N) writes N to the current output stream or
put(Stream, N) writes N to
a specified one, Stream. N should be a legal ASCII
character code or an integer expression.
If N evaluates to an integer, the least significant 8 bits are written.
The character is not necessarily printed immediately; they may be flushed if the buffer is full. See ref-iou-sfh-flu.
Cf. ttyput/1.