linux while和until循環項目案例
項目腳本案例
1. 判斷局域網主機存活腳本（主要吸取判斷方法，利用until判斷，避免多次使用if條件判斷）
#!/bin/bash declare -i i=0 declare -i j=1 #++++++++++++++++++++利用until判斷用戶輸入是否合法++++++++++++++++++++++++++++++++++++++ until [[ $netid =~ ([0-9]{1,3}\.){3}[0-9]{1,3} ]];do #如果滿足條件則退出循環，否則進入循環 read -p "Input network(eg:192.168.0.0): " netid let i++ if [ $i -eq 3 ];then #如果3次錯誤輸入，則退出腳本 echo "Input network times out!" exit 1 fi done net=`echo $netid|cut -d. -f1-3` #+++++++++++++++++++++++ping function++++++++++++++++++++++++++++++++++++++++++++++++++++ Ping () { #定義函數ping的主體 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 #調用函數 |
2.利用while循環及調用系統本身function，每2s監控網站是否正常？
#!/bin/bash . /etc/rc.d/init.d/functions #執行系統函數調用 #+++++++++++++++++++++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 #調用系統函數action，其中fales時echo $? 假 else action "$1 is ok." /bin/true fi #action函數再次調用一系列函數組成ok和fail sleep 2 done } run "$1" [[email protected] ~/test]#./curl.sh http://www.baidu.com |
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linux while和until循環項目案例