shell脚本–筛选出合法ip地址

作者：蓝眼泪

#!/bin/bash

grep "^[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}$" /root/ip.txt >/root/ip_test1.txt

line=$(wc -l /root/ip_test1.txt |awk '{print $1}')
echo "" >/root/ip_test.txt
for (( i=1;i<=$line;i=i+1 ))
do 
   cat /root/ip_test1.txt |awk ' NR=="$i" {print} ' >/root/ip_test2.txt
   a=$( cat /root/ip_test2.txt |cut -d "." -f 1 )
   b=$( cat /root/ip_test2.txt |cut -d "." -f 2 ) 
   c=$( cat /root/ip_test2.txt |cut -d "." -f 3 )
   d=$( cat /root/ip_test2.txt |cut -d "." -f 4 )
   if [ "$a" -lt 1 -o "$a" -gt 255 ]
       then
    		continue 
   fi

   if [ "$b" -lt 0 -o "$b" -gt 255 ]
     then
   	 	continue 
   fi

   if [ "$c" -lt 0 -o "$c" -gt 255 ]
	then
        	continue
   fi
 
   if [ "$d" -lt 0 -o "$d" -gt 255 ]
	then
	   	continue
   fi
  
   cat /root/ip_test2.txt >> /root/ip_test.txt

done
#  rm -rf /root/ip_test1.txt
#  rm -rf /root/ip_test2.txt