https://cgit.freedesktop.org/systemd/systemd/tree/src/udev/udev-builtin-net_id.c https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L12 https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/

Two character prefixes based on the type of interface:
 *   en -- ethernet
 *   sl -- serial line IP (slip)
 *   wl -- wlan
 *   ww -- wwan

SO Answer: Find available network interfaces

ls /sys/class/net | grep -E "^e(m|n(o|p|s)|th[0-9])|wl(an|p)" find /sys/class/net ! -type d | xargs --max-args=1 realpath | awk -F\/ '/pci/{print $NF}'

ip r | grep " src "|cut -d " " -f 3,12 | xargs ip addr show | awk '/inet.*brd/{print $NF}' ip -o link show up | awk -F': ' '{print $2}' ip -o -4 addr show ip -o link ls up lshw -class network

`em1 eno1 enp0s31f6 enp0s29u1u2 enp2s0 enp2s0f1 enp5s0 enp7s0 ens1 enx78e7d1ea46da eth0 p7p1

wlan0 wlp0s12f0 wlp3s0 wlp3s0b1 wlp19s0

wwp0s29u1u4i6`