How to kill a process on a port on ubuntu

Question

I am trying to kill a process in the command line for a specific port in ubuntu.

If I run this command I get the port:

sudo lsof -t -i:9001

so...now I want to run:

sudo kill 'sudo lsof -t -i:9001'

I get this error message:

ERROR: garbage process ID "lsof -t -i:9001".
Usage:
  kill pid ...              Send SIGTERM to every process listed.
  kill signal pid ...       Send a signal to every process listed.
  kill -s signal pid ...    Send a signal to every process listed.
  kill -l                   List all signal names.
  kill -L                   List all signal names in a nice table.
  kill -l signal            Convert between signal numbers and names.

I tried sudo kill 'lsof -t -i:9001' as well

FYI, Ubuntu questions have better chance of being answered on the Ubuntu part of the StackExchange (StackOverflow) network: http://askubuntu.com — JScoobyCed, Feb 19 '12 at 03:06
Honestly, you should use fuser, as it is very simple, but whatever. — CrazyVideoGamer, Feb 02 '21 at 16:11

score 1751 · Accepted Answer · edited May 03 '22 at 04:00

1751

You want to use backtick, not regular tick:

sudo kill -9 `sudo lsof -t -i:9001`

If that doesn't work, you could also use $() for command interpolation:

sudo kill -9 $(sudo lsof -t -i:9001)

edited May 03 '22 at 04:00

armanexplorer

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answered Feb 19 '12 at 02:47

zellio

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@FrancescoGramano: you don't want to use -9 unless you have to. – zellio Jun 01 '15 at 16:55
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when `sudo kill` can't kill the process, @putra.koreng 's method works well – Fangxin Dec 15 '17 at 01:07
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if above is not working then try this: https://stackoverflow.com/a/50515868/9339242 – Arayan Singh May 24 '18 at 18:29
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Is this OS independent or linux specific? If Linux specific then, even this command works `os.system("fuser -k 8080/tcp");` – Ridhuvarshan Jul 25 '18 at 12:04
This closes my browser entirely https://stackoverflow.com/a/19621849/4579897 works – Winnipass Jan 18 '19 at 14:50
`sudo fuser 9001/tcp -k` in case the above command does not work for you. – Armin Jul 23 '19 at 19:18
You may want to run the inner part (i.e. `sudo lsof -t -i:9001`) to check to see what processes are returned. For me, it returned PIDs for both the server _and_ clients, which is probably what happened to @AdamWinnipass. – webelo Sep 23 '19 at 10:26
sudo kill -9 `sudo lsof -t -i:8000` – Ashish Sahu Aug 25 '20 at 17:12
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Does not work anymore. Only comes up with a help command for both commands – Epic Speedy Mar 28 '21 at 17:31
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@EpicSpeedy It shows you the help command when it doesn't find the process that you want to kill. That means you probably chose a wrong port or the process stop already – Youssef N Mar 28 '22 at 11:00
It is highly recommended *not* to use `kill -9` unless you have to. `kill -9` will just rip the process out of the process table and clean up what the OS knowns about (e.g. memory). Instead use `kill -HUP`, if that doesn't work then `kill -INT`, then if necessary `kill -9`. The first two will give the process a chance to clean up its own matters before exiting. – Philip Kearns Oct 26 '22 at 14:33
Also works on mac much better than others I've tried – Max Carroll Feb 02 '23 at 11:41
just for myself `sudo kill -9 $(sudo lsof -t -i:3000)` – Sasha Kos Apr 05 '23 at 21:23

score 412 · Answer 2 · edited Dec 11 '13 at 19:57

412

you can use

fuser -n tcp -k 9001

see more details in wikipedia

edited Dec 11 '13 at 19:57

fjsj

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answered Oct 27 '13 at 18:35

putra.koreng

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If not root: sudo fuser -n tcp -k 9001 – JLavoie Jan 11 '16 at 00:19

score 157 · Answer 3 · edited Oct 07 '21 at 05:37

157

FOR UBUNTU 1- Find what application/process is using the pro, type:

sudo netstat -lpn |grep :8080

and press Enter.

You will get an output similar to this one

tcp6       0      0 :::8080                 :::*                    LISTEN      6782/java

2- I have got the process Id, which is 6782, now this is the process that is using port 8080.

3- Kill the process, type: kill -p 6782

kill -9 6782

edited Oct 07 '21 at 05:37

Lemon Kazi

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answered May 01 '15 at 10:39

Mohit Singh

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This didn't work for me. even I tried to kill process with `sudo` on Ubuntu 20.04 – Muhammad Tariq Nov 26 '20 at 13:24
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@MuhammadTariq Try using kill -9 {PID} – CrazyVideoGamer Jan 17 '21 at 22:57
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Step 3: reply: kill -p 6782 by: kill -9 6782 -> it work for me – Le Nguyen May 18 '21 at 11:23
I used sudo and it worked – Zekarias Taye Hirpo Jan 08 '22 at 21:21
@MuhammadTariq then you don't have running process on that port. – Praveen Patel Apr 19 '22 at 12:29
It worked for me everytime. Thanks @Mohit Singh – Saikat Roy Aug 17 '22 at 05:19

score 119 · Answer 4 · edited Oct 17 '21 at 11:14

119

The best way to kill a port in the Ubuntu terminal is with the fuser command; e.g.:

fuser -k 9001/tcp

This sends SIGKILL by default.

edited Oct 17 '21 at 11:14

Cody Gray - on strike

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answered Sep 29 '17 at 11:00

Vishnu S Babu

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this didn't work for me on local host 3000 – Wayne Dec 22 '22 at 00:46

Arayan Singh · Answer 5 · 2019-05-21T09:47:35.453

To kill a process running on Port number 9001

sudo kill -9 $(sudo lsof -t -i:9001)


lsof   - list of files(Also used for to list related processes)

-t     - show only process ID

-i     - show only internet connections related process

:9001  - show only processes in this port number

kill   - command to kill the process

-9     - forcefully

sudo   - command to ask admin privilege(user id and password).

for more you can visit my blog

User16119012 · Answer 6 · 2014-10-06T07:08:38.130

37

There are some process which does not shown using normal netstat command, so you have to check it using sudo.

Do sudo netstat -lpn |grep :8080. Process running by system does not show PID, to get PID of this process you will have to run it using sudo

And then killl the process using port 8080. You may have to use sudo here as well. So to kill this process use sudo kill -9 PID

edited Oct 06 '14 at 07:08

answered May 15 '14 at 11:21

User16119012

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Abdennour TOUMI · Answer 7 · 2017-05-02T13:31:51.133

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Use killport command :

sh killport 9001

To Download shell ,you can use wget :

wget https://cdn.rawgit.com/abdennour/miscs.sh/e0aac343/killport

edited May 02 '17 at 13:31

answered Oct 31 '13 at 10:23

Abdennour TOUMI

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if it is not work , that it means the target port is already closed – Abdennour TOUMI Aug 19 '14 at 11:37

score 19 · Answer 8 · edited Aug 10 '22 at 07:36

19

killport <port>

Add this code in your CLI and use this alias.

killport () {
  PID=$(sudo lsof -t -i:$1)
  sudo kill -9 ${PID}
}

edited Aug 10 '22 at 07:36

FalcoGer

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answered Aug 09 '22 at 20:56

Towfiqul Islam

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What "below bash code"? – miken32 Aug 09 '22 at 23:27
added screenshot of the function which I added in ".bashrc" – Towfiqul Islam Aug 10 '22 at 07:32
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Best answer I've seen in a while! – JAN Aug 13 '22 at 05:16

score 15 · Answer 9 · edited Jun 28 '19 at 15:38

To kill the process based on port first we have to find out the relevant pid for given port and kill using that pid,

In my case i wanted to get the pid(process id) of 3000 port:

netstat -ltnp | grep -w '3000'

then find pid which is listening to tcp

tcp6       0      0 :::3000                 :::*                    LISTEN      29972/node

you will get pid 29972

To kill this pid use below command

kill -9 29972

pseudo code for kill process based on port

 netstat -ltnp | grep -w 'PORT'

and

kill -9 PID

PHP Hupp Technologies · Answer 10 · 2021-12-27T11:14:34.500

14

sudo kill -9 $(sudo lsof -t -i:9001) worked for me or you can use

sudo kill -9 `sudo lsof -t -i:9001`

replace 9001 with port number you want.

edited Dec 27 '21 at 11:14

answered Dec 22 '21 at 04:50

PHP Hupp Technologies

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score 12 · Answer 11 · edited Feb 03 '16 at 02:50

12

Use this:

sudo kill -9 $(lsof -t -i:9001)

edited Feb 03 '16 at 02:50

Pang

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answered Feb 02 '16 at 10:10

delpha

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this worked for me on ubuntu 20.04, This is best because it merge 2 steps into one command. – joe-khoa Apr 14 '22 at 07:03

score 11 · Answer 12 · answered Dec 05 '21 at 18:47

11

Just enter the following command in the terminal

kill -9 $(lsof -t -i:3000)

answered Dec 05 '21 at 18:47

Nishant Kumar

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score 11 · Answer 13 · answered May 02 '23 at 05:36

11

Lets consider If you want to kill a port 3000.

Step 1: Run this command, which will give u its PID.

sudo lsof -t -i:3000

This returned me PID as 291141

Step 2: Run this command to kill the port using PID.

sudo kill -9 291141

Boom!!! Port killed

answered May 02 '23 at 05:36

ANOOP NAYAK

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score 6 · Answer 14 · answered Nov 28 '21 at 16:18

6

you can use following command in terminal
fuser -k 3000/tcp

answered Nov 28 '21 at 16:18

Naveen Kumar

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score 5 · Answer 15 · edited Jun 09 '17 at 07:42

5

Kill PORT:

sudo is important to show process id.

$ sudo netstat -antlp | grep 45136
tcp      0      0 0.0.0.0:45136         0.0.0.0:*        LISTEN           **-** 

$ kill -9 45136

edited Jun 09 '17 at 07:42

Lnux

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answered Sep 21 '16 at 09:44

Guna Sekaran

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score 5 · Answer 16 · answered Aug 11 '17 at 10:00

Use the command

 netstat -plten |grep java

used grep java as tomcat uses java as their processes.

It will show the list of processes with port number and process id

tcp6       0      0 :::8080                 :::*                    LISTEN      
1000       30070621    16085/java

the number before /java is a process id. Now use kill command to kill the process

kill -9 16085

-9 implies the process will be killed forcefully.

score 5 · Answer 17 · answered Aug 24 '20 at 11:14

5

If I was you,I would use

fuser -k -n tcp PORT
kill -9 PID

answered Aug 24 '20 at 11:14

Loveli

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knaitas · Answer 18 · 2023-06-24T21:59:16.680

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Just add an alias to your .bashrc / .zshrc:

Open new terminal
nano .bashrc
scroll down and add an alias: alias kp='kill_process_by_port() { sudo kill -9 $(sudo lsof -t -i:"$1"); }; kill_process_by_port "$@"'
ctrl + x +y
source .bashrc
kp 9000

edited Jun 24 '23 at 21:59

answered Nov 28 '22 at 17:50

knaitas

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lsof: unacceptable port specification in: -i : lsof 4.93.2 latest revision: https://github.com/lsof-org/lsof latest FAQ: https://github.com/lsof-org/lsof/blob/master/00FAQ latest (non-formatted) man page: https://github.com/lsof-org/lsof/blob/master/Lsof.8 usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-E] [+|-e s] [+|-f[gG]] [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s] [+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names] Use the ``-h'' option to get more help information. kill: (8000): No such process – texas697 May 06 '23 at 21:38
Fixed: `alias kp='kill_process_by_port() { sudo kill -9 $(sudo lsof -t -i:"$1"); }; kill_process_by_port "$@"'` – knaitas Jun 24 '23 at 21:58

score 4 · Answer 19 · answered Jun 16 '17 at 18:39

4

Try this:

lsof -i :port

or 

sudo kill $(sudo lsof -t -i:8000)

or

kill -9 <pid>

or 

sh killport 8000

answered Jun 16 '17 at 18:39

Ranvijay Sachan

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I'm on Ubuntu 17 and `kill -9 ` worked great for me! – protoEvangelion Aug 10 '17 at 21:32

score 3 · Answer 20 · answered Mar 14 '17 at 07:42

3

sudo kill `sudo lsof -t -i:9001`

you don't have to add the -9signal option

answered Mar 14 '17 at 07:42

davidblumer

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score 3 · Answer 21 · answered Jun 22 '20 at 14:36

It gives me an error OSError: [Errno 98] Address already in use. using the following method solved my error in Ubuntu.(VERSION="18.04.4 LTS (Bionic Beaver)")

$ sudo netstat -lpn |grep :5000
tcp        0      0 0.0.0.0:5000            0.0.0.0:*               LISTEN      25959/uwsgi   

$ fuser -k -n tcp 5000
5000/tcp:            25959

Hope it will help someone!

score 2 · Answer 22 · edited Jan 20 '21 at 09:47

2

xargs can be a very useful command.

You can pipe commands like this

lsof -t -i :9001 | xargs sudo kill

What it does: it takes the output from the first command, in this case the process running on port, and will pass it to sudo kill.

edited Jan 20 '21 at 09:47

TT.

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answered Jan 20 '21 at 09:23

Vadim

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score 2 · Answer 23 · answered Oct 17 '21 at 06:18

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get PID of process running on port 3000:

lsof -i tcp:3000
kill th process

kill -9 process_id

Example:
lsof -i tcp:3000
(PID in output = 5805)
kill -9 5805

use sudo if required

answered Oct 17 '21 at 06:18

shekhar677

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score 1 · Answer 24 · answered Aug 01 '18 at 09:06

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Its two steps process:

Know process id on port no. 8080 (can be any)

Kill process of that id 8689 (can be different)

fuser -n tcp 8080

#o/p 8080/tcp    8689

kill -9 8689

answered Aug 01 '18 at 09:06

Ratnesh Kushwaha

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score 1 · Answer 25 · answered Oct 30 '18 at 08:49

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you can work this using node

npm install freethenport -g

then

node freethenport 9001

answered Oct 30 '18 at 08:49

Adeojo Emmanuel IMM

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score 1 · Answer 26 · answered Apr 01 '19 at 07:15

Displays active TCP connections, ports on which the computer is listening.

netstat -tupln

It will list you all the connection along pid. Find and copy the pid and run the following command. Make sure you replace the with actual id in the following command.

kill -9 <copied pid>

-9 use to forcefully kill the connection.

score 1 · Answer 27 · answered Sep 23 '21 at 13:23

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When using newer versions of Ubuntu you won't have netcat anymore, instead you use ss

ss -lptpn | grep 9001   
sudo kill <replace-with-process-id>

answered Sep 23 '21 at 13:23

Francisco Cardoso

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score 1 · Answer 28 · answered May 22 '22 at 10:26

1

sudo netstat -lpn |grep :8080

than get the PID of this process

kill -9

answered May 22 '22 at 10:26

Salma Aboumzrag

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score 1 · Answer 29 · answered Jun 18 '22 at 03:12

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You can also use xargs. Just run the following,

sudo lsof -t -i:443 | xargs sudo kill -9

answered Jun 18 '22 at 03:12

Avi

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As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Jun 23 '22 at 06:40

Arnold Ighiwiyisi · Answer 30 · 2023-03-20T18:32:29.133

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On my ubuntu-22.04 machine, this worked to kill port 8000

fuser -k 8000/tcp

edited Mar 20 '23 at 18:32

answered Mar 20 '23 at 12:23

Arnold Ighiwiyisi

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How to kill a process on a port on ubuntu

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