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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 CENTOS

unbound-streamtcp

unbound-streamtcp(1)						      unbound						      unbound-streamtcp(1)

NAME

       unbound-streamtcp - unbound DNS lookup utility

SYNOPSIS

       unbound-streamtcp [-unsh] [-f ipaddr[@port]] name type class

DESCRIPTION

       unbound-streamtcp sends a DNS Query of the given type and class for the given name to the DNS server over TCP and displays the response.

       If  the	server to query is not given using the -f option then localhost (127.0.0.1) is used. More queries can be given on one commandline,
       they are resolved in sequence.

       The available options are:

       name   This name is resolved (looked up in the DNS).

       type   Specify the type of data to lookup.

       class  Specify the class to lookup for.

       -u     Use UDP instead of TCP. No retries are attempted.

       -n     Do not wait for the answer.

       -s     Use SSL.

       -h     Print program usage.

       -f ipaddr[@port]
	      Specify the server to send the queries to. If not specified localhost (127.0.0.1) is used.

EXAMPLES

       Some examples of use.

       $ unbound-streamtcp www.example.com A IN

       $ unbound-streamtcp -f 192.168.1.1 www.example.com SOA IN

       $ unbound-streamtcp -f 192.168.1.1@1234 153.1.168.192.in-addr.arpa. PTR IN

EXIT CODE

       The unbound-streamtcp program exits with status code 1 on error, 0 on no error.

AUTHOR

       This manual page was written by Tomas Hozza <thozza@redhat.com>.

NLnet Labs							   Mar 21, 2013 					      unbound-streamtcp(1)
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