Sysfs/network devices

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Get the device name by listing the /sys/class/net directory contents using ls -al or the tree command (provided by the app-text/tree package):

user $tree /sys/class/net
/sys/class/net/
├── enp2s14 -> ../../devices/pci0000:00/0000:00:1e.0/0000:02:0e.0/net/enp2s14
├── lo -> ../../devices/virtual/net/lo
├── sit0 -> ../../devices/virtual/net/sit0
└── wlp8s0 -> ../../devices/pci0000:00/0000:00:1c.0/0000:08:00.0/net/wlp8s0