CODEWITHSUNDEEP
unixportfreebsdpid
Cyclone
Cyclone

Reputation: 15279

Determine the process pid listening on a certain port

As the title says, I'm running multiple game servers, and every of them has the same name but different PID and the port number. I would like to match the PID of the server which is listening on certain port, and then I would like to kill this process. I need that in order to complete my bash script.

Is that even possible? Because it didn't find yet any solutions on the web.

Upvotes: 110

Views: 264286

Answers (8)

stanwise
stanwise

Reputation: 2412

The -p flag of netstat gives you PID of the process:

netstat -l -p

*use sudo if showing - instead of PID

Edit: The command that is needed to get PIDs of socket users in FreeBSD is sockstat. As we worked out during the discussion with @Cyclone, the line that does the job is:

sockstat -4 -l | grep :80 | awk '{print $3}' | head -1

Upvotes: 133

Debashish Sen
Debashish Sen

Reputation: 746

Syntax:

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

Example: To kill the process running at port 4200, run following command

kill -9 $(lsof -t -i:4200)

Tested in Ubuntu.

Upvotes: 5

Jan Wilmans
Jan Wilmans

Reputation: 823

on windows, the netstat option to get the pid's is -o and -p selects a protocol filter, ex.: netstat -a -p tcp -o

Upvotes: 4

gavenkoa
gavenkoa

Reputation: 48893

netstat -p -l | grep $PORT and lsof -i :$PORT solutions are good but I prefer fuser $PORT/tcp extension syntax to POSIX (which work for coreutils) as with pipe:

pid=`fuser $PORT/tcp`

it prints pure pid so you can drop sed magic out.

One thing that makes fuser my lover tools is ability to send signal to that process directly (this syntax is also extension to POSIX):

$ fuser -k $port/tcp       # with SIGKILL
$ fuser -k -15 $port/tcp   # with SIGTERM
$ fuser -k -TERM $port/tcp # with SIGTERM

Also -k is supported by FreeBSD: http://www.freebsd.org/cgi/man.cgi?query=fuser

Upvotes: 17

Glavin001
Glavin001

Reputation: 1356

I wanted to programmatically -- using only Bash -- kill the process listening on a given port.

Let's say the port is 8089, then here is how I did it:

badPid=$(netstat --listening --program --numeric --tcp | grep "::8089" | awk '{print $7}' | awk -F/ '{print $1}' | head -1)
kill -9 $badPid

I hope this helps someone else! I know it is going to help my team.

Upvotes: 3

dafky2000
dafky2000

Reputation: 74

Since sockstat wasn't natively installed on my machine I hacked up stanwise's answer to use netstat instead..

netstat -nlp | grep -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\:2000" | awk '{print $7}' | sed -e "s/\/.*//g""

Upvotes: 3

Laurynas
Laurynas

Reputation: 3869

Short version which you can pass to kill command:

lsof -i:80 -t

Upvotes: 160

user1276209
user1276209

Reputation:

netstat -nlp should tell you the PID of what's listening on which port.

Upvotes: 11

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