ss(8) - another utility to investigate sockets
-h, --help
       Show summary of options.
-V, --version
       Output version information.
-n, --numeric
       Do not try to resolve service names.
-r, --resolve
       Try to resolve numeric address/ports.
-a, --all
       Display both listening and non-listening (for TCP this means established connections) sockets.
-l, --listening
       Display only listening sockets (these are omitted by default).
-o, --options
       Show timer information.
-e, --extended
       Show detailed socket information
-m, --memory
       Show socket memory usage.
-p, --processes
       Show process using socket.
-i, --info
       Show internal TCP information.
-s, --summary
       Print  summary  statistics. This option does not parse socket lists obtaining summary from various
       sources. It is useful when amount of sockets is so huge that parsing /proc/net/tcp is painful.
-4, --ipv4
       Display only IP version 4 sockets (alias for -f inet).
-6, --ipv6
       Display only IP version 6 sockets (alias for -f inet6).
-0, --packet
       Display PACKET sockets (alias for -f link).
-t, --tcp
       Display TCP sockets.
-u, --udp
       Display UDP sockets.
-d, --dccp
       Display DCCP sockets.
-w, --raw
       Display RAW sockets.
-x, --unix
       Display Unix domain sockets (alias for -f unix).
-f FAMILY, --family=FAMILY
       Display sockets of type FAMILY.  Currently the  following  families  are  supported:  unix,  inet,
       inet6, link, netlink.
-A QUERY, --query=QUERY, --socket=QUERY
       List of socket tables to dump, separated by commas. The following identifiers are understood: all,
       inet, tcp, udp, raw, unix, packet, netlink, unix_dgram, unix_stream, packet_raw, packet_dgram.
-D FILE, --diag=FILE
       Do not display anything, just dump raw information  about  TCP  sockets  to  FILE  after  applying
       filters. If FILE is - stdout is used.
-F FILE, --filter=FILE
       Read  filter  information  from  FILE.   Each line of FILE is interpreted like single command line
       option. If FILE is - stdin is used.