linux while和until循环项目案例

Posted 2020-10-04

 项目脚本案例

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1. 判断局域网主机存活脚本（主要吸取判断方法，利用until判断，避免多次使用if条件判断）

#!/bin/bash    declare -i  i=0    declare -i  j=1     #++++++++++++++++++++利用until判断用户输入是否合法++++++++++++++++++++++++++++++++++++++    until [[  $netid =~ ([0-9]{1,3}\.){3}[0-9]{1,3} ]];do  #如果满足条件则退出循环，否则进入循环           read -p "Input  network(eg:192.168.0.0): " netid           let i++           if [ $i -eq 3 ];then                            #如果3次错误输入，则退出脚本                   echo "Input network times  out!"                   exit 1           fi   done   net=`echo  $netid|cut -d. -f1-3`    #+++++++++++++++++++++++ping function++++++++++++++++++++++++++++++++++++++++++++++++++++   Ping () {                                               #定义函数ping的主体   while [ $j  -lt 255 ];do           if ping -c1 -w1 $net.$j  &>/dev/null;then                   echo "$net.$j is  up"           else                   echo "$net.$j is  down"           fi           let j++   done   }   Ping                                                    #调用函数

2.利用while循环及调用系统本身function，每2s监控网站是否正常？

#!/bin/bash   .  /etc/rc.d/init.d/functions                           #执行系统函数调用 #+++++++++++++++++++++arg  select+++++++++++++++++++++++++++++++++++++++++++++++++++++ if [ $# -ne 1 ];then         echo  $"usage $0 url"         exit 1 fi #++++++++++++++++++++web  monitor+++++++++++++++++++++++++++++++++++++++++++++++++++++ flag=`curl -o /dev/null --connect-timeout 5 -s -w  "%{http_code}" $1|egrep -w "200|301|302"|wc -l` run (){ while true;do     if [ $flag  -ne 1 ];then                 action  "$1 is error." /bin/false    #调用系统函数action，其中fales时echo $? 假         else                 action  "$1 is ok." /bin/true     fi                                               #action函数再次调用一系列函数组成ok和fail sleep 2 done } run "$1" [[email protected] ~/test]#./curl.sh http://www.baidu.com http://www.baidu.com is ok.                                [  OK  ] http://www.baidu.com is ok.                                [  OK  ]

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