guess number game in shell script

guess.sh

#!/bin/sh

# 猜数字游戏Shell版程序

function generateGoal()
{ # 生成被猜数字
    # 准备一个包含0-9的池
    local pool=($(seq 0 9))
    for i in $(seq 0 3)
    do
        # 从池中随机抽取并删除一个数字
        let pick=${RANDOM}%${#pool[@]}
        num[$i]=${pool[$pick]}
        pool=(${pool[@]:0:$pick} ${pool[@]:$(($pick+1))})
    done
    echo ${num[@]}
}

function split2array()
{ # 将连续的数字分割成空格分割的形式
    local n=$*
    echo $n | sed 's/./& /g'
}

function isValidGuess()
{ # 验证输入数字格式是否合理
    # 取得不重复字符数量
    local n=$(echo $*|tr ' ' '\n'|sort|uniq|wc -l)
    if [[ $n -eq 4 ]] && [[ $# -eq 4 ]]
    then
        # 确认每一位是否为数字
        for p in $*
        do
            case $p in
                [^0-9])
                    # 不是数字，返回错误码1
                    return 1
            esac
        done
    else
        # 不重复字符数量不对，返回错误码2
        return 2
    fi
}

function readNumber()
{ #从标准输入取得数字并确认合法性
    read -p 'You guess: ' input
    local a=$(split2array $input)
    isValidGuess $a && echo $a
}

function generateHint()
{ #生成线索
    #从参数中取得猜数和答案
    local guess=($(echo $*|cut -d ' ' -f 1-4))
    local goal=($(echo $*|cut -d ' ' -f 5-8))
    #初始化A、B的值
    local a=0
    local b=0
    #比较猜数与答案
    for (( i = 0; i < ${#guess[@]}; i++ ))
    do
        local g=${guess[$i]}
        if [[ g -eq ${goal[$i]} ]]
        then
            #当同一位置的猜数与答案一致时，A加一
            ((a++))
        elif echo ${goal[@]}|grep $g > /dev/null 2>&1
        then
            #当某一位猜数在答案中存在时，B加一
            ((b++))
        fi
    done
    #输出线索，当已经完全猜对时，追加输出字母W作为标记
    echo "${a}A${b}B $([[ $a -eq 4 ]] && echo "W")"
}

function printBanner()
{
    echo "*****************************************************************************"
    echo "*                            GUESS NUMBER                                   *"
    echo "*****************************************************************************"
}

function game()
{
    local chance=8
    local goal=$(generateGoal)
    local loseMsg="You Lose. The number is $(echo $goal|tr -d ' ')"
    
    #即便强制退出了，也要告诉玩家，他输了。
    trap 'echo;echo $loseMsg;exit' INT
    
    echo "Find the number if you can."

    for remain in $(seq $chance -1 1)
    do
        case $remain in
            1)
                echo "This is the LAST chance.";;
            *)
                echo "There are $remain changes.";
        esac
        until guess=$(readNumber)
        do
            echo "Input format wrong."
            echo "Please input a 4-digit number without same digit."
        done
        #将线索以数组形式存储
        local result=($(generateHint $guess $goal))
        echo "My hint:   ${result[0]}"
        echo "=============="
        if [[ ${#result[@]} -gt 1 ]]
        then
            #当附带有胜利信息时，宣告胜利
            echo "You Win!"
            break
        fi
    done
    if [[ ${#result[@]} -le 1 ]]
    then
        echo $loseMsg
    fi
    trap - INT
}

printBanner
until [[ $exit ]]
do
    game
    select sel in "Play again?" "Exit"
    do
        case $sel in
            Exit)
                exit=1
                break;;
            *)
                break;;
        esac
    done
done

!/bin/bash ?

Not working...

$ ./guess.sh

---

•                        GUESS NUMBER                                   *
  

  ---

  Find the number if you can.
  You Lose. The number is 1460
  1. Play again?
  2. Exit
     #?

fixed. worked on Mac but not linux. seq is different a little.