Simple scripts for Linux beginners----match legitimate IP

#!/bin/bash# author: tianzhaogao  (e-mail: [email protected]) #ip .txt  IP file to match # okip.txt  matches the legitimate iprm -rf /root/test/okip.txt     #初始化touch  /root/test/ okip.txt      #初始化ip =$ (cat ip.txt | grep  "^[0-9]\{1,3\}\.[ 0-9]\{0,3\}\. [0-9]\{0,3\}\. [0-9]\{0,3\}] for i in  $ip     do         n1=$ (echo  "$i"  | cut -d  "."  -f 1)         n2=$ (echo  "$i"  | cut -d   "."  -F 2)         n3=$ (echo  "$i"  | cut -d   "."  -f 3)         n4=$ (echo  "$i"  | cut -d   "."  -F 4)                  if [  "$n 1"  -lt 255 -a  "$n 2"  -lt 255 -a  "$n 3"  -lt 255 -a  "$n 4"  - lt 255 ];then            echo  "$i"  >> okip.txt        fi    done

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Simple scripts for Linux beginners----match legitimate IP