这篇文章是云计算学习路线教程代码笔记关于Shell编程for循环结构的内容。
for i in {取值范围}
do
循环体
done
求取1-100数字的和、找出1-100中能被2整除的数字、找出1-100中的素数、找出1-100种能被3整除的数字
#!/usr/bin/env bash
#
Author: bavdu
Email: [email protected]
Github: https://github.com/bavdu
Date: 2019//
sum=0
for i in {1..100}
do
let total=$sum+$i #或者写成let total=i++
done
printf "$total\n"
测试生产环境中的主机存活性
#!/usr/bin/env bash
#
Author: bavdu
Email: [email protected]
Github: https://github.com/bavdu
Date: 2019//
ip_alive.txt
ip_down.txt
export segment="192.168.161"
for i in {2..254}
do
{
ping -c1 $segment.$i &>/dev/null
if [ $? -eq 0 ];then
printf "alive: $segment.$i\n" >>ip_alive.txt
else
printf "down: $segment.$i\n" >>ip_down.txt
fi
}&
done
wait
printf "$(date +%Y-%m-%d_%k:%M:%S) -exec filename:$0\n"