Linux while and until loop project cases

Project Script Case

1. Determine the local area network host survival script (mainly draw judgment method, use until judgment, avoid multiple use if condition to judge)

#!/bin/bash Declare-i i=0 Declare-i j=1 #++++++++++++++++++++ use until to determine whether user input is legitimate ++++++++++++++++++++++++++++++++++++++ until [[$netid =~ ([0-9]{1,3}\.) {3} [0-9] {1,3}]];d o #如果满足条件则退出循环, otherwise enter the loop Read-p "Input Network (eg:192.168.0.0):" NetID Let i++ If [$i-eq 3];then #如果3次错误输入, exit the script 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];d o 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. Is it normal for every 2s monitoring website to use the while loop and call the system itself function?

#!/bin/bash . /etc/rc.d/init.d/functions #执行系统函数调用 #+++++++++++++++++++++arg select+++++++++++++++++++++++++++++++++++++++++++++++++++++ If [$#-ne 1];then echo $ "Usage $ 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 "is error."/bin/false #调用系统函数action, where Fales echo $? false Else Action "is OK."/bin/true Fi #action函数再次调用一系列函数组成ok和fail Sleep 2 Done } Run "$" [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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Linux while and until loop project cases