restore(){
    # 备份文件夹
    BACKUP_PATH=/backup
    n=0
    # 从备份文件夹读取10条最新的记录
    for bak in `ls -t $BACKUP_PATH|sed -n '1,10p'`
    do
     n=$((n+1))
     printf "[%s] %s\n" "$n" "$bak"
     eval "bak${n}=$bak"
    done

    if [ "$n" -eq 0 ]
    then
    echo >&2 "未找到备份文件"
    exit
    fi

    printf "选择需要恢复的备份文件ID(1 to %s)：" "$n"
    read -r num
    num=$(printf "%s\n" "$num" |tr -dc '[:digit:]')
    if [ "$num" -le 0 ] || [ "$num" -gt "$n" ]
    then
    echo >&2 "输入有误"
    exit 1
    else
    eval "bak=\$bak${num}"
    fi

    RESTORE_PATH=$BACKUP_PATH/$bak
    #下面进行恢复操作
}