Determine the process pid listening on a certain port

Question

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

User · Answer

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

User · Answer

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

User · Answer

Short version which you can pass to kill command   lsof -i 80 -t

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

[unix] Determine the process pid listening on a certain port

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