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Nice idea Corona668 .

I don't have access to MacOS, I'm amazed the most recent releases ship with a 12 year old shell (whats going on there). Checking the exit status of read after the stty...

Since you specify using bash shell we can flush the input buffer using:

while read -rs -N 1 -t 0.1 2> /dev/null ; do : ; done

so your script would look like this:

#!/bin/bash

for i in 1 2...