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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 NETBSD

route.conf

ROUTE.CONF(5)						      BSD File Formats Manual						     ROUTE.CONF(5)

NAME

     route.conf -- static routes config file

DESCRIPTION

     The route.conf file is read by the staticroute rc.d script during system start-up and shutdown, and is intended for adding and removing
     static routes.

   FILE FORMAT
     Lines starting with a hash ('#') are comments and ignored.  Lines starting with a plus sign ('+') are run during start-up, while lines start-
     ing with a minus sign ('-') are run during system shutdown.  If a line starts with a '!', the rest of the line will get evaluated as a shell
     script fragment.  All other lines are passed to route(8).	During start-up, they are passed behind a ``route add -'' command and during shut-
     down behind a ``route delete -'' command.

FILES

     /etc/route.conf	 The route.conf file resides in /etc.

     /etc/rc.d/staticroute
			 rc.d(8) script that parses route.conf.

EXAMPLES

     In this example, the interface for the desired routing changes is set, the IP address on that interface is determined, and a route is added
     during startup, or deleted during system shutdown.

	   # Set interface and determine current IP address for added route.
	   !ifname=bnx0
	   !ipaddr=$(/sbin/ifconfig ${ifname} | awk '$1 == "inet" {print $2}')
	   net 10.10.1 -interface ${ipaddr}

     In this example, IP forwarding is turned on during start-up, and a static route added for 192.168.2.0.  During system shutdown, the route is
     removed and IP forwarding turned off.

	   # Turn on/off IP forwarding.
	   +sysctl -w net.inet.ip.forwarding=1
	   -sysctl -w net.inet.ip.forwarding=0
	   net 192.168.2.0 -netmask 255.255.255.0 192.168.150.2

SEE ALSO

     rc.conf(5), rc(8), route(8)

BSD
								    May 1, 2012 							       BSD
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