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

#!/bin/env sh

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

awkscript='
  {
    letters="ァアィイゥウェエォオカガキギクグケゲコゴサコゴサザシジスズセゼソゾタダチヂッツヅテデトドナニヌネノハバパヒビピフブプヘベペホボポマミムメモャヤュユョヨラリルレロヮワヰヱヲンヴヵヶヷヸヹヺ・ーヽヾ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"