数组和随机数

数组：可以将一组数值放到其中，根据其下标来调用
随机数：用于随机取值，非常实用

• 搭配数组和随机数的实验，随机选择早上的早餐

#!/bin/bash
eat[1]="汉堡"
eat[2]="油条"
eat[3]="炸鸡"
eat[4]="包子"
eat[5]="泡面"
eat[6]="煎饼"
eat[7]="饺子"
eat[8]="嫂子"
eat[9]="牛奶"
eatnum=9   ====>总个数

check=$(($RANDOM * $eatnum / 32767  + 1 ))
echo "your may eat ${eat[${check}]}"
echo "your may eat ${eat[$check]}"
#####执行结果
[root@k8s-node2 ~]# ./what_to_eat.sh 
your may eat 牛奶
your may eat 牛奶

• 随机选择三种不同早餐

#!/bin/bash
eat[1]="汉堡"
eat[2]="油条"
eat[3]="炸鸡"
eat[4]="包子"
eat[5]="泡面"
eat[6]="煎饼"
eat[7]="饺子"
eat[8]="嫂子"
eat[9]="牛奶"
eatnum=9

eated=0

while [ "$eated" -lt 3 ]; do
        check=$(( $RANDOM * $eatnum  / 32767 + 1 ))
        mycheck=0
        if [ $eated -ge 1 ];then
                for i in `seq $eated`
                do
                        if [ ${eatedcon[$i]} == $check ]; then
                                mycheck=1  
                        fi
            
                done
        fi 
        if [ $mycheck == 0 ];then
                echo "your may eat$ ${eat[$check]}"
                eated=$(( $eated + 1 ))
                eatedcon[$eated]=$check
        fi
done
####执行结果
[root@k8s-node2 ~]# ./what_to_eat02.sh
your may eat$ 牛奶
your may eat$ 泡面
your may eat$ 饺子

学习笔记