port availability- linux redhat 5

vicky007aggrwal · 12-06-2012, 07:51 AM

Hi All,

I am using "lsof -i:<Port Number>" & "netstat -anp| grep <port number>" commands to check
the free ports available on my Linux(redhat) machine.

But the problem with above commands is that, it wont show the process details of a particular port
if it is running from an user account which is different with which i logged in.

Do we have any command or work around by which we can check whether a port is owned by any process (or any other user account )
even if we dont have root access.

Please suggest

acid_kewpie · 12-06-2012, 09:40 AM

Pretty sure it's not possible, maybe you can run it via sudo securely?

vicky007aggrwal · 12-06-2012, 09:42 AM

oh seriously , so there is no way out to find the ports owned by different user accounts as i dont have root or sudo access

chrism01 · 12-06-2012, 11:02 PM

Actually, if you try eg netstat as non-root, it actually tells you this

Code:

 netstat -tanp
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)

vicky007aggrwal · 12-06-2012, 11:33 PM

I am not able to see the non-owned process info for a particular port,so only ROOT can check which all ports are owned by users

acid_kewpie · 12-07-2012, 02:13 AM

Quote:

Originally Posted by chrism01

Actually, if you try eg netstat as non-root, it actually tells you this

Code:

 netstat -tanp
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)

you got the options wrong, it should be -pant. Sadly -s can't be used, otherwise I'd get to write -pants a dozen times a day. ;-)

chrism01 · 12-07-2012, 03:52 AM

Nice

vicky007aggrwal · 03-12-2013, 06:02 AM

I am still getting below error , when i am using netstat -pant| grep 10003.It doesnt give the desired result

(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)

acid_kewpie · 03-12-2013, 10:28 AM

Quote:

Originally Posted by vicky007aggrwal

I am still getting below error , when i am using netstat -pant| grep 10003.It doesnt give the desired result

(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)

Where does it say that's an error? It clearly says that you need to be root... what else are we suppose to add?

vicky007aggrwal · 03-12-2013, 10:49 AM

I mean without being root does this mean that i cannot locate the process running on particular port if it is owned by differnt user id with which i logged in ?

acid_kewpie · 03-12-2013, 11:02 AM

yes, that would be a privilege violation if it were possible.

vicky007aggrwal · 03-12-2013, 01:18 PM

Thanks chris