This will send SIGTERM signals (the default) to all processes using TCP port 53. You can then pipe this output to the kill command with any signal option. This will only print the PIDs of the processes without any other information. To kill those processes, you can use the -t option with lsof. This will print some information about each process using that port, including its PID. For example, to see which processes are using TCP port 53 (typically used for DNS requests), you can run this command: To list the processes that are using a specific port number, you can use the following syntax:Īs before, protocol can be tcp or udp, while port is the port number you want to check. This command can list open files and sockets on your system. How to Kill a Linux Process Using the lsof CommandĪnother way to kill a process using a port number on a Linux PC is to use the lsof command. If you run into any issues, run these commands as the super user (using the sudo command) or by using the root user instead. This will kill all processes using TCP port 80 forcefully. However, this may cause data loss or corruption, so use it cautiously. This will send a kill signal (SIGKILL), which can help to force the currently running processes you’ve identified to terminate immediately. If some processes don’t respond to SIGTERM, you can use -KILL instead of -k. This will kill all processes using TCP port 80. This will send a SIGTERM signal to each process, asking them to terminate gracefully. To kill those processes, you can add the -k option to fuser. This will print the process IDs (PIDs) of the processes using that port. For example, to see which processes are using TCP port 80, you can run: In this example, protocol can be tcp or udp, while port is the port number you want to check.
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