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Full Discussion: Filtering netstat command output
Top Forums UNIX for Beginners Questions & Answers Filtering netstat command output Post 303042065 by sravani25 on Thursday 12th of December 2019 02:38:22 PM
Old 12-12-2019
Filtering netstat command output
Hi All,


I am trying to collect the listen ports info from netstat command in centos 7

From that info i am trying to collect all the foreign address IP for those ports.


I am using below script to do the same.


Code:
netstat -an |grep -w  "LISTEN" |grep -v "127.0.0.1" |awk '{print $4}' > /tmp/q1

sed 's/::/ALL/g' /tmp/q1 > /tmp/q2

for i in $(cat /tmp/q2 |awk -F ":" '{print $2}' |sort |uniq);do


abc=$(netstat -an |grep -w  "ESTABLISHED" |grep -v "127.0.0.1" | awk -v chr="$i" '$4 ~ chr'|awk '{print $5}' |awk -F ":" '{print $1}'|sort |uniq)

echo "$abc"


done


I am getting the required output now.


OUPUT :



Code:
192.168.20.232
192.168.10.114
192.168.10.175
192.168.10.183
192.168.10.7
192.168.10.93
192.168.20.120
192.168.20.154
192.168.20.170



my questions are

1) Now i want to ignore these ports records and print remaining records.
I tried with by changing the syntax of below variable in the script



Code:
abc=$(netstat -an |grep -w  "ESTABLISHED" |grep -v "127.0.0.1" | awk -v  chr="$i" '$4 !~ chr'|awk '{print $5}' |awk -F ":" '{print $1}'|sort  |uniq)

but it's printing duplicate values
Can someone please help me on this issue
Last edited by Scrutinizer; 12-12-2019 at 04:19 PM.. Reason: code tags please
 

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LEARN ABOUT DEBIAN

net::arp

ARP(3pm)						User Contributed Perl Documentation						  ARP(3pm)

NAME

       ARP - Perl extension for creating ARP packets

SYNOPSIS

	 use Net::ARP;
	 Net::ARP::send_packet('lo',		     # Device
			       '127.0.0.1',	     # Source IP
			       '127.0.0.1',	     # Destination IP
			       'aa:bb:cc:aa:bb:cc',  # Source MAC
			       'aa:bb:cc:aa:bb:cc',  # Destinaton MAC
			       'reply');	     # ARP operation

       $mac = Net::ARP::get_mac("eth0");

       print "$mac
";

       $mac = Net::ARP::arp_lookup($dev,"192.168.1.1");

       print "192.168.1.1 has got mac $mac
";

   IMPORTANT
       Version 1.0 will break with the API of PRE-1.0 versions, because the return value of arp_lookup() and get_mac() will no longer be passed as
       parameter, but returned!  I hope this decision is ok as long as we get a cleaner and more perlish API.

   DESCRIPTION
       This module can be used to create and send ARP packets and to get the mac address of an ethernet interface or ip address.

       send_packet()
	     Net::ARP::send_packet('lo',		 # Device
				   '127.0.0.1', 	 # Source IP
				   '127.0.0.1', 	 # Destination IP
				   'aa:bb:cc:aa:bb:cc',  # Source MAC
				   'aa:bb:cc:aa:bb:cc',  # Destinaton MAC
				   'reply');		 # ARP operation

	     I think this is self documentating.
	     ARP operation can be one of the following values:
	     request, reply, revrequest, revreply, invrequest, invreply.
	     The default ARP operation is reply.

       get_mac()
	     $mac = Net::ARP::get_mac("eth0");

	     This gets the MAC address of the eth0 interface and stores
	     it in the variable $mac. The return value is "unknown" if
	     the mac cannot be looked up.

       arp_lookup()
	     $mac = Net::ARP::arp_lookup($dev,"192.168.1.1");

	     This looks up the MAC address for the ip address 192.168.1.1
	     and stores it in the variable $mac. The return value is
	     "unknown" if the mac cannot be looked up.

SEE ALSO

	man -a arp

AUTHOR

	Bastian Ballmann [ Balle@chaostal.de ]
	http://www.datenterrorist.de

COPYRIGHT AND LICENSE

       Copyright (C) 2004-2007 by Bastian Ballmann

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.1 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2009-04-24								  ARP(3pm)
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