shell编程练习002（20160227）

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1.写一个脚本getinterface.sh，脚本可以接受参数(i,I,a)，完成以下任务：
(1)使用以下形式：getinterface.sh [-i interface|-I IP|-a]
(2)当用户使用-i选项时，显示其指定网卡的IP地址；
(3)当用户使用-I选项时，显示其后面的IP地址所属的网络接口；
(4)当用户单独使用-a选项时，显示所有的网络接口及其IP地址（lo除外）;

#! /bin/bashfunction Print_Help(){        echo "getinterface.sh [-i interface | -I IP | -a]"}function Para_Check(){        local paranum=$1        if ([ $paranum = '-a' ] || [ $paranum = '-i' ] || [ $paranum = '-I' ]);then                echo "OK"        else                echo "ff"                Print_Help                exit        fi}function List_Nic(){        echo `ifconfig  -a | grep -v "127" | grep -B 1 "inet " | awk '/eth/{print $1;next} /inet/{print $2}' | sed '{N;s/\n//g}'`}function Get_IP(){        if [ $1 == "-i" ];then                echo `ifconfig $2 | grep "inet " | awk '{print $2}'`        elif [ $1 == "-I" ];then                echo `ifconfig -a | grep -B 1 $2 | grep "eth" | awk -F ":" '{print $1}'`        else                echo "end"                Print_Help        fi}function main(){        Para_Check $@        Para=$@        if [ $# -eq 1 ];then                List_Nic        elif [ $# -eq 2 ];then                Get_IP $Para        else                Print_Help        fi}main $@

执行情况如下
[root@LFG1000105234 ~]# ./getinterface.sh -a
OK
eth0:189.101.0.5 eth1:192.168.1.4 eth2:189.101.7.5 eth3:189.101.8.254 eth4:192.168.0.62 eth5:189.100.1.254 eth6:189.100.2.254
[root@LFG1000105234 ~]# ./getinterface.sh -i eth2
OK
189.101.7.5
[root@LFG1000105234 ~]# ./getinterface.sh -a
OK
eth0:189.101.0.5 eth1:192.168.1.4 eth2:189.101.7.5 eth3:189.101.8.254 eth4:192.168.0.62 eth5:189.100.1.254 eth6:189.100.2.254
[root@LFG1000105234 ~]# ./getinterface.sh -tt
ff
getinterface.sh [-i interface | -I IP | -a]
[root@LFG1000105234 ~]# ./getinterface.sh -I 189
OK
eth0 eth2 eth3 eth5 eth6

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