matrix.sh

#!/bin/bash

### Customization:
blue="\033[0;34m"
brightblue="\033[1;34m"
cyan="\033[0;36m"
brightcyan="\033[1;36m"
green="\033[0;32m"
brightgreen="\033[1;32m"
red="\033[0;31m"
brightred="\033[1;31m"
white="\033[1;37m"
black="\033[0;30m"
grey="\033[0;37m"
darkgrey="\033[1;30m"
# Choose the colors that will be used from the above list
# space-separated list
# e.g. `colors=($green $brightgreen $darkgrey $white)`
colors=($green $brightgreen)
### End customization

### Do not edit below this line
spacing=${1:-100} # the likelihood of a character being left in place
scroll=${2:-0} # 0 for static, positive integer determines scroll speed
screenlines=$(expr `tput lines` - 1 + $scroll)
screencols=$(expr `tput cols` / 2 - 1)

# chars=(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 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 ^)
# charset via Carl:
chars=(ï½± ï½² ï½³ ï½´ ï½µ ｶ ï½· ｸ ï½¹ ｺ ï½» ï½¼ ï½½ ï½¾ ｿ ï¾€ ï¾x129 ﾂ ﾃ ﾄ ï¾… ﾆ ﾇ ﾈ ﾉ ﾊ ﾋ ﾌ ï¾x141 ﾎ ï¾x143 ï¾x144 ﾑ ï¾’ ﾓ ï¾” ﾕ ï¾– ï¾— ﾘ ï¾™ ﾚ ï¾› ﾜ ï¾x157)

count=${#chars[@]}
colorcount=${#colors[@]}

trap "tput sgr0; clear; exit" SIGTERM SIGINT

if [[ $1 =~ '-h' ]]; then
  echo "Display a Matrix(ish) screen in the terminal"
  echo "Usage:    matrix [SPACING [SCROLL]]"
  echo "Example:  matrix 100 0"
  exit 0
fi


clear
tput cup 0 0
while :
  do for i in $(eval echo {1..$screenlines})
    do for i in $(eval echo {1..$screencols})
      do rand=$(($RANDOM%$spacing))
        case $rand in
          0)
            printf "${colors[$RANDOM%$colorcount]}${chars[$RANDOM%$count]} "
            ;;
          1)
            printf "  "
            ;;
          *)
            printf "\033[2C"
            ;;
        esac
      done
      printf "\n"

      # sleep .005
    done
    tput cup 0 0
  done