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Finding the own IP address on macOS (or any other *nix) system can be done e.g. by combining a few terminal commands along with some regex.

On most macOS the default WiFi device is called en0. On most linux distributions it’s eth0.

macOS:

ifconfig en0 | grep -Eo '([0-9]+.[0-9]+.[0-9]+.[0-9]+)' | head -n 1

Linux:

ifconfig eth0 | grep -Eo '([0-9]+.[0-9]+.[0-9]+.[0-9]+)' | head -n 1

It works as follows:

• Get the network configuration for the network interface en0
• Filter the output through regex
  • 1 or more occurence of the characters 0-9 followed by a dot, 1 or more occurences… (xxx.xxx.xxx.xxx)
• Use head -n 1 in order to get only the first result of grep