bash / kill-process-by-port

bash kill process by port number

Quick Answer

# macOS / Linux — find and kill by port
kill -9 $(lsof -t -i:8080)

# Linux alternative using fuser
fuser -k 8080/tcp

# Check what is on the port first
lsof -i :8080
# or
ss -tlnp | grep 8080

Usage

A development server is still running from a previous session and blocking the port.

Other causes & fixes

Find PID without killing

# Get PID(s) listening on port 3000
lsof -t -i:3000

# More detail: PID, process name, user
lsof -i :3000

# Linux: netstat alternative
ss -tlnp | grep :3000

Kill gracefully first, then force

pid=$(lsof -t -i:8080)
kill $pid           # SIGTERM — graceful shutdown
sleep 2
kill -9 $pid 2>/dev/null || true  # SIGKILL if still running

Multiple processes on the same port

# lsof -t returns multiple PIDs
lsof -t -i:8080 | xargs kill -9

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