So how do you list the network open ports on your Linux server and the process that owns them? The answer is simple. Use the following command (must be run as the root user):
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sudo lsof -i
sudo netstat -lptu
sudo netstat -tulpn
Sample outputs (see video demo):
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Why command df and du reports different output?
| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |
Shameless plug to a really good article I wrote about lsof and some of the more nifty tricks:
Troubleshooting running systems with lsof
Hi,
We recently did patching in our linux servers and want to know which process is using which patch. Do we have any linux command to know that.
Thanks in advance
Ankita
Thanks Vikrant for the useful tip…I’ve used lsof for ages but sort of taken it for granted,didn’t check the man pages, and wasn’t aware of this option.
Great (!!!) site, by the way, I’ll start contributing my own tips as well. Thanks for giving me lots of ideas-projects to increase my understanding of Linux/BSD.
Thanks
Very useful, thanks
What should I do when netstat lists the PID as “-” and lsof doesn’t list anything for that port? I know something is listening on that port because “nc -z -v -w1 1-65534” says so.
@paul: did you run the commands as root?
@jeff
Thanks for the reply! Yes, I did run all the commands as root. I ran nc from both a different machine on the network and also the same machine that has the port open.
Any ideas?
Running sudo lsof -i gives me command not found?
Can you try “which lsof” and see if it tells the path. If it does, try using the full path and see if this works?
If not, try installing using apt-get install lsof and try then.
Thanks!
What music is played in the video “Linux List The Open Ports And The Process That Owns Them”
Thanks.