ss

ss

antとかanuとかのアレ

$ ss -V
ss utility, iproute2-ss161212
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=17.10
DISTRIB_CODENAME=artful
DISTRIB_DESCRIPTION="Ubuntu 17.10"

       -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).
(略)
       -t, --tcp
              Display TCP sockets.

       -u, --udp
              Display UDP sockets.

ssの例のアレのその後がまだよく分かっていないが、今日現在でss -antuってやったらudpも出てきたから直っているのではなかろうか Moving on from net-tools [LWN.net]