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check open ports

Terminal - check open ports
lsof -Pni4 | grep LISTEN
2009-08-21 22:51:41
User: evenme
Functions: grep
18
check open ports

Tested in Linux and OSX

Alternatives

There are 2 alternatives - vote for the best!

Terminal - Alternatives
netstat -plnt
2011-09-30 19:56:32
User: DopeGhoti
Functions: netstat
6

While `lsof` will work, why not use the tool designed explicitly for this job?

(If not run as root, you will only see the names of PID you own)

lsof -Pn | grep LISTEN
netstat -plntu
lsof -i
2011-10-03 02:06:30
User: shsingh
-1

This option selects the listing of all Internet and x.25 (HP-UX) network files.

lsof -Pi | grep LISTEN
2011-10-03 12:50:18
User: 5partan
Functions: grep
-2

This option is much faster, as it checks only network nodes.

Know a better way?

If you can do better, submit your command here.

What others think

what is wrong with using `netstat`?

netstat -an | grep LISTEN

does the same and works everywhere, even where `lsof` is not present...

Comment by ceesaxp 380 weeks and 3 days ago

Someones wont see that unix streams.

Comment by bandie91 380 weeks and 3 days ago

netstat -luntp

is my choice

Comment by Charon 380 weeks and 1 day ago

netstat don't provide service name and don't work with same behavior in all unix system.

Comment by evenme 376 weeks and 1 day ago

lsof gives all open ports, even those opened by trojans/rootkits which are usually hidden from netstat

Comment by zlemini 350 weeks and 3 days ago

"won't see unix streams" incorrect; /bin/netstat does indeed show UNIX sockets

"netstat doesn't provide service name" which is a good thing, since /etc/services might not be what you expect when diagnosing a stranger's machine.

"...usually hidden from netstat" until you encounter malware that has learned to corrupt lsof as well as netstat.

My beef is that lsof can hang if there are mounted filesystems that have timed-out (a frequent problem with NFS and CIFS), despite having nothing to do with the TCP/UDP/unix sockets that you are trying to find out about.

Comment by Mozai 270 weeks and 2 days ago

I think it's important to remember that both offer similar information and are useful in diagnosing issues. The more tools in you box the more likely you'll fix the problem. This is especially true if you tend to hop OSes and the command you'd normally use is not available on a different OS.

Cheers,

Mikel King

http://jafdip.com

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Comment by xiaozhengm 45 weeks and 2 days ago

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