lsof

command process

List open files and the processes using them

Required Packages

sudo apt install -y lsof

Options

Search mode *

Port number

Protocol

File path

Username

Process ID

Command name

Match commands starting with this string

Directory path

Numeric output (-n) Numeric output (-n)

Don't resolve hostnames (faster)

No port name resolution (-P) No port name resolution (-P)

Show port numbers instead of service names

sudo lsof -i :