判斷輸入是否是IP

[root@localhost tmp]# cat test.sh

#!/bin/bash

##get & test if input is a IP

touch .tmp_ip_test_file_jkj22s4wfdg
while [ -e .tmp_ip_test_file_jkj22s4wfdg ]
do
        # get input ip
        read -p "please input local ip:" IP

        # 0 is a IP ,1 is not a IP
        JIEGUO=` echo $IP | awk -F'.' '{if( ($1<256 && $1>0) && ($2<256 && $2>=0) && ($3<256 && $3 >=0) && ($4<256 && $4>=0) && NF==4) print 0;else print 1}' `

        # test if is a IP
        if [ $JIEGUO = 0 ]
        then
                echo $IP
                rm -f .tmp_ip_test_file_jkj22s4wfdg
        else
                echo "The input is a bad IP !  Try again!"
        fi
done

 

只是一個簡陋的判斷。