石头剪刀布

#!/usr/bin/bash
declare -A array_key
array_key=(["rock"]=0 ["paper"]=1 ["scissors"]=2)
array_=(rock paper scissors)
key=1
stty erase '^H'
while [ $key -eq 1 ]
do
        let system_key_index=$RANDOM%3
        echo -e -n "\e[34mPlease input you gesture( rock or paper or scissors or quit): \e[0m"
        read self_key
        # exit
        if [ "$self_key" == "quit" ];then
                echo "Good bay!"
                exit
        fi
        # input error
        self_key_index=${array_key[$self_key]}
        if [ -z $self_key_index ];then
        echo "you input error!please input again!"
                continue
        fi
        let right=($system_key_index+1)%3
        echo -e "\e[32mcomputer input ${array_[$system_key_index]}"
        echo -e "you input $self_key\e[0m"
        if [ $system_key_index -eq $self_key_index ];then
                echo -e "\e[36myou are draw\e[0m!"
        elif [ $right -eq $self_key_index ];then
                echo -e "\e[35myou are win!\e[0m"
        else
                echo -e "\e[31myou are failure!\e[0m"
        fi
done