shell脚本实例-matrix

[Sat Feb 27 17:51:36 1038 /dev/pts/0 192.168.2.250 ~/sh]#cat matrix

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"

colors=($blue $brightgreen $grey)

spacing=${1:-100}

scroll=${2:-0}

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 1 2 3 4 5 6 7 8 9 0 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)

count=${#chars[@]}

colorcount=${#colors[@]}

trap "tput sgr0; clear; exit" SIGTERM SIGINT

if [[ $1 =~ "-h" ]]

  then

  echo "display a matrix 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 $(eval echo {1..$screenlines})

      do

      rand=$(($RANDOM%$spacing))

      case $rand in

       0)

        printf "${colors[$RANDOM%$colorcount]}${chars[$RANDOM%$count]} ";;

       1)

        printf "  ";;

       *)

        printf "\033[2C";;

      esac

     done

     printf "\n"

    done

    tput cup 0 0

done