You are wrong. STDIN means Standard INPUT. STDOUT means Standard OUTPUT. There is no design/hardware/software limitation to reading and writing to them at th

You are wrong. STDIN means Standard INPUT. STDOUT means Standard OUTPUT. There is no design/hardware/software limitation to reading and writing to them at the same time. That's your bidirectional channel with that one process. >stdin is for receiving data from the program in the pipeline before you, and stdout is for sending data to the thing in the pipeline after you Yes, and you took that from my comment here: https://news.ycombinator.com/item?id=43947777 https://news.ycombinator.com/item?id=43947777 Did you just wanted to ratify my argument, or is there something else you want to add?