Get the system's IP address(es) (ip, grep)

ip addr show | grep -Eo 'inet (addr:)?([0-9]{1,3}\.){3}[0-9]{1,3}' | grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}'

Retrieves and prints the system's IPv4 address(es) by parsing the output of the `ip addr show` command.