matrix

#!/bin/bash

characters=(a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9)

tput setaf 5
tput setab 0

while true; do
  clear
  character=${characters[$((RANDOM % ${#characters[@]}))]}
  printf "\e[$((RANDOM % 80))G$character"
  sleep 0.01
done