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netstat grep regex suspend script help

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# 1  
Old 11-01-2012
Linux netstat grep regex suspend script help
Hi

I am trying to create a suspend script which will suspend the system only if it cant find port 9982 four or more times OR 192.168.0.:microsoft-ds ESTABLISHED in the output of netstat -t.

I am struggling with the 9982 bit, googling etc I came up with
Code:
if netstat -t|grep -P "(9982){4,}"

but this does not return anything when there is four or more instances of 9982.

Also is this script okay?

Code:
#!/bin/bash
if netstat -t|grep -P "(9982){4,}" ; then
	exit
	elif
	netstat -t|grep -P "192.168.0.:microsoft-ds ESTABLISHED" ; then
	exit
        elif
	echo pm-suspend
fi

Any help would be appreciated Smilie
Last edited by Scrutinizer; 11-01-2012 at 05:34 PM.. Reason: code tags
# 2  
Old 11-01-2012
I have a question.

When you say 9982 four or more times, do you mean 4 lines with port number: 9982 or 4 or more alphanumeric character after port number: 9982?

Can you post a sample output of netstat which you are trying to capture for port number: 9982?
# 3  
Old 11-01-2012
I mean four or more instances of port 9982 in the whole of the output so it would match the below and more instances of port 9982 appearing in the output:

Code:
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 htpc.local:9982         192.168.0.4:62101       ESTABLISHED
tcp        0      0 htpc.local:50767        htpc.local:9982         ESTABLISHED
tcp        0      0 htpc.local:40573        192.168.0.2:mysql       TIME_WAIT
tcp        0    420 htpc.local:9982         192.168.0.4:62124       ESTABLISHED
tcp        0      0 htpc.local:9982         htpc.local:50767        ESTABLISHED
tcp        0      0 htpc.local:40574        192.168.0.2:mysql       TIME_WAIT
tcp        0      0 htpc.local:40572        192.168.0.2:mysql       TIME_WAIT
tcp        0     52 htpc.local:ssh          192.168.0.4:60655       ESTABLISHED

Last edited by Scrutinizer; 11-01-2012 at 05:34 PM.. Reason: code tags
# 4  
Old 11-01-2012
Try this code:-

Code:
#!/bin/bash

if [ `netstat -t | grep ":9982" | wc -l` -ge 4 ]
then
      exit 1
elif [ `netstat -t | grep "192.168.0.:microsoft-ds ESTABLISHED" | wc -l` -ne 0 ]
then
      exit 1
else
      echo pm-suspend
fi

I hope it helps.
# 5  
Old 11-01-2012
Thanks I'll try it.

Can you explain wc -l` -ge ?
# 6  
Old 11-01-2012
wc -l counts the number of lines
-ge Greater than or Equal to check
This User Gave Thanks to Yoda For This Post:
bilboNIX
# 7  
Old 11-01-2012
Yes I think this will work after testing with echo, I now just need to google how to cron it.

Thank you!
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