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Find and Kill Process Running on Specific Port in Linux

Free up occupied ports (e.g., port 3000 or 8080) blocked by zombie node/python processes.

Jump to:#Solution #Generator #How it works #Gotchas #Performance #Alternatives #FAQ

Alex ChenReviewed by Expert

Staff DevOps & Infrastructure Architect

📖3 min read

•

📝430 words

•

📅Updated 2026-10-30

Verified Command (Single-Click Copy)

Updated: 2026-10-30

bash

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sudo fuser -k 3000/tcp

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📋 Prerequisites

State Changing / Caution

✓psmisc package installed
✓sudo privileges

💡 Primary Use Cases

EADDRINUSE Port Collision in Local Dev:

Instantly kill orphan background web server processes.

# How It Works

`fuser -k` immediately sends a SIGKILL to any process bound to the specified TCP port number.

Expected Terminal Output

3000/tcp:            28491
[Process 28491 terminated]

⚠️

Gotcha & Common Pitfall

Check which process is running first before killing it blindly using `lsof -i :3000`.

⚡

Performance & Complexity

Time ComplexityO(1)

Space (Memory)O(1)

Mutates OriginalYes (In-Place)

ℹ️ Terminates OS process immediately.

✓

Environment & Version Support

Ubuntu / Debian

psmisc packageVerified

macOS (Darwin)

lsof + killVerified

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# Alternative Methods & Variations

Inspect first with lsof

See PID and process name before terminating.

bash

Press C to copy

sudo lsof -i :3000
kill -9 <PID>

🔍 People Also Ask (Related Quick Answers)

How to see all listening ports in Linux?sudo ss -tulpn

How to find process by name in Linux?pgrep -l process_name

Frequently Asked Questions about Find and Kill Process Running on Specific Port in Linux

What if fuser command not found on my system?▼

Install it via "sudo apt install psmisc" on Ubuntu/Debian or "sudo dnf install psmisc" on Fedora/RHEL.

How do I run this on macOS?▼

macOS does not have fuser by default. Use: "kill -9 $(lsof -t -i:3000)".

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Tags:#linux#port#kill#networking#sysadmin