40. until用法

6.2 until循环

vim until_num.sh

#!/bin/bash
num="$1"
until [ $num -lt 1 ]
do
    echo "$num"
    ((num--))
done    

6.3 while 求和

#!/bin/bash
num=1
sum=0
while [ $num -le 100 ]
do
    ((sum=sum+num))
    ((num++))
done
[ "$sum" -ne 0 ] && printf "1+2+..100= $num\n"

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最后更新: 2022-02-19 13:59:07