find out which procses is using port linux

sudo lsof -i:22sudo lsof -i:<port_number>sudo ss -lptn 'sport = :80'$ sudo ss -lptn 'sport = :80'
State   Local Address:Port  Peer Address:Port              
LISTEN  127.0.0.1:80        *:*                users:(("nginx",pid=125004,fd=12))
LISTEN  ::1:80              :::*               users:(("nginx",pid=125004,fd=11))
active port