gistfile1.sh

#!/bin/env sh

lines=$(tput lines)
cols=$(tput cols)

awkscript='
  {
    letters="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789@#$%^&*()"

    lines=$1
    random_col=$3

    c=$4
    letter=substr(letters,c,1)

    cols[random_col]=0;

    for (col in cols) {
      line=cols[col];
      cols[col]=cols[col]+1;

      printf "\033[%s;%sH\033[2;32m%s", line, col, letter;
      printf "\033[%s;%sH\033[1;37m%s\033[0;0H", cols[col], col, letter;

      if (cols[col] >= lines) {
        cols[col]=0;
      }
    }
  }
'

echo -e "\e[1;40m"
clear

while :; do
  echo $lines $cols $(( $RANDOM % $cols)) $(( $RANDOM % 72 ))
  sleep 0.05
done | awk "$awkscript"

is there a way to use japanese ascii characters?

just change the letters string to japanese characters

Are you able to use this on cmd?

How to adjust size