写一个脚本checkipadd.sh,判断所输入的参数是否为正确的IP地址，如 果是就输出"This is ip address";如果不是就输出"This is not ip address" (1

写一个脚本checkipadd.sh,判断所输入的参数是否为正确的IP地址，如

果是就输出"This is ip address";如果不是就输出"This is not ip address"

测试如下输入值:

192.168.0.199

95.0.0.1

24.234.2345.1

192.a1.123.0

1a2.1.1.0

01.1.1.1

123

#!/bin/bash

read -p "请输入要检测的IP地址：" input

ip=`echo $input | sed -n '/\./p'`

yi0=`echo $ip |cut -d '.' -f1 `

yi=`echo $yi0 |grep ^0 -v `

if [ $yi -ge 0 -a $yi -lt 256 ] &>/dev/null;then

er0=`echo $ip |cut -d '.' -f2`

sum2=`echo $er0 | wc -c`

[ $sum2 -eq 2 ] && er=`echo $er0 `

[ $sum2 -ge 3 ] && sum2_1=`echo $er0|cut -c1` && [ $sum2_1 -eq 0 ] && echo "This is not ip address" && exit || er=`echo $er0 `

if [ $er -ge 0 -a $er -lt 256 ] &>/dev/null;then

san0=`echo $ip |cut -d '.' -f3`

sum3=`echo $san0 | wc -c`

[ $sum3 -eq 2 ] && san=`echo $san0 `

[ $sum3 -ge 3 ] && sum3_1=`echo $san0|cut -c1` && [ $sum3_1 -eq 0 ] && echo "This is not ip address" && exit || san=`echo $san0 `

if [ $san -ge 0 -a $san -lt 256 ] &>/dev/null;then

si0=`echo $ip |cut -d '.' -f4`

sum4=`echo $si0 | wc -c`

[ $sum4 -eq 2 ] && si=`echo $si0 `

[ $sum4 -ge 3 ] && sum4_1=`echo $si0|cut -c1` && [ $sum4_1 -eq 0 ] && echo "This is not ip address" && exit || si=`echo $si0 `

if [ $si -ge 0 -a $si -lt 256 ] &>/dev/null;then

echo "This is ip address"

else

echo "This is not ip address"

fi

else

echo "This is not ip address"

fi

else

echo "This is not ip address"

fi

else

echo "This is not ip address"

fi

请输入要检测的IP地址：192.168.0.199

This is ip address

请输入要检测的IP地址：95.0.0.1

This is ip address

请输入要检测的IP地址：24.243.2345.1

This is not ip address

请输入要检测的IP地址：192.a1.123.0

This is not ip address

请输入要检测的IP地址：1a2.1.1.0

This is not ip address

请输入要检测的IP地址：01.1.1.1

This is not ip address

请输入要检测的IP地址：123

This is not ip address