ss - is used to dump socket statistics, and to investigate sockets

To list all Connections $ ss

To list Listening and Non-listening Ports $ ss -a

To list Listening Sockets $ ss -l

To list all TCP connections $ ss -t

To list all listening TCP connections $ ss -lt

To list all UDP connections $ ss -ua

To list all listening UDP connections $ ss -lu

To display PID of sockets $ ss -p

To display summary statistics $ ss -s

To display IPv4 and IPv6 socket connections $ ss -4 $ ss -6

To filter connections by port number $ ss -at '( dport = :22 or sport = :22 )' $ ss -at '( dport = :80 or sport = :80 )' $ ss -at '( dport = :ssh or sport = :ssh )' $ ss -at '( dport = :http or sport = :http )'

regards, T.Dhanasekar