Icon  Name                    Last modified      Size  Description
[PARENTDIR] Parent Directory                             -   

Linux

 ip a | grep -1 ether

 for i in /sys/class/net/en*/address ; do echo -n "${i}: " ; cat $i ; done

 for i in /sys/class/net/en*/address ; \
  do echo -n "${i}: " ; cat $i ; done |  cut -d'/' -f5-


macOS

 ifconfig | grep -B 7 ' active'


Windows PoweShell

 Get-NetAdapter -Physical