How to list networking services in linux as like netstat in windows & How to kill the service runs in linux under some port identified with lsof

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To list networking services in Linux similarly to netstat in Windows, use the ss command. While netstat is historically available in Linux, it is now deprecated in favor of ss, which is significantly faster and pre-installed on all modern distributions. [1, 2, 3, 4, 5]

The Equivalent Commands

Windows Command [1, 2, 3]	Modern Linux Equivalent (ss)	Legacy Linux Equivalent (netstat)
netstat -ano	sudo ss -tulnp	sudo netstat -tulnp

Command Options Breakdown

The specific flags used in the Linux commands mimic the behavior of Windows networking lookups:

• -t: Displays TCP ports.
• -u: Displays UDP ports.
• -l: Shows only listening sockets (active services waiting for connections).
• -n: Shows numerical addresses and port numbers (prevents slow DNS lookups).
• -p: Shows the Process ID (PID) and the process name running the service. Note: Running this with sudo is required to see process ownership details. [1, 2, 3, 4]

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Alternative: Using lsof

If you need to find a networking service bound to a highly specific port, the lsof (List Open Files) utility is a powerful alternative: [1, 2, 3]

bash

sudo lsof -i :80

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(Replace 80 with the specific port number you want to investigate). [1]

If you would like to dive deeper, let me know:

• Do you need to filter for a specific port or protocol?
• Are you looking to track real-time changes to network connections?
• Do you want to see how much bandwidth a specific service is using? [1]

To kill a Linux process running on a specific port found using lsof, execute the following command:

bash

sudo kill -9 $(sudo lsof -t -i :<PORT_NUMBER>)

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Replace <PORT_NUMBER> with your actual port (e.g., 8080). [1, 2, 3]

1. The Two-Step Method

If you prefer to verify the process before terminating it, split the action into identification and deletion steps. [1]

Find the Process ID (PID) [1]

Run lsof to view the service name and its associated numerical PID: [1]

bash

sudo lsof -i :8080

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• -i :8080: Filters results specifically to network files operating on port 8080.
• sudo: Forces the system to display processes owned by other users or system accounts. [1, 2]

Example Output:

text

COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
node     3821 root   23u  IPv4  0x8a9    0t0  TCP *:8080 (LISTEN)

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Kill the Process

Use the kill command along with the exact PID displayed in the second column of your lsof output: [1]

bash

sudo kill 3821

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• This sends a default SIGTERM signal, requesting a clean, safe shutdown.
• If the process fails to close, force termination using sudo kill -9 3821, which sends a SIGKILL signal. [1, 2, 3]

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2. The One-Liner Automation Method

To bypass manual PID lookups, combine lsof and kill into a single command string via shell substitution: [1, 2]

bash

sudo kill -9 $(sudo lsof -t -i :8080)

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• -t: Strips down the lsof output to return only raw PID numbers.
• $(...): Feeds those exact numbers directly into the kill command as arguments. [1, 2, 3, 4]

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3. Alternative Alternative: The fuser Shortcut

If lsof is unavailable, use the native fuser tool to close ports quickly without hunting down process numbers. [1, 2]

bash

sudo fuser -k 8080/tcp

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• -k: Instantly delivers a termination signal to every active process tied to the port.
• 8080/tcp: Defines the port number alongside its designated transport protocol layer. Use 8080/udp if terminating a UDP port instead. [1, 2, 3]