-P : Inhibits the conversion of port numbers to port names for network files.Let us run the following to check open TCP and UDP ports using the lsof command: Tcp LISTEN 0 5 :631 :* users: ( ( "cupsd",pid = 1821,fd=9 ) ) Listening ports and applications using lsof command Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port It can display more TCP and state information than other tools. It allows showing information similar to netstat. The ss command is used to dump socket statistics. | grep LISTEN : Only display open ports by applying grep command filter.-p : Show the PID and name of the program to which each socket belongs.Proto Recv-Q Send-Q Local Address Foreign Address State User Inode PID/Program name Similarly, TCP port 22 opened by sshd process and sshd listing on all IP address for ssh connections: Using netstat to list open portsįor example, TCP port 631 opened by cupsd process and cupsd only listing on the loopback address (127.0.0.1). Let us see all commands and examples in details. Finally, one can use nmap command to check TCP and UDP ports too.Apart from ss/ netstat one can use the lsof command to list open files and ports on Linux based system.
Another option is to use the netstat command to list all ports in Linux.Use ss command to display all open TCP and UDP ports in Linux.The procedure to monitor and display open ports in Linux is as follows: Display a list of applications and their ports assigned by IANA Check open ports in Linux
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