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