`ip a` but only the parts you care about

main.go

package main

import (
	"fmt"
	"net"
	"os"
	"text/tabwriter"
)

func main() {
	interfaces, err := net.Interfaces()
	if err != nil {
		panic(err)
	}

	w := tabwriter.NewWriter(os.Stdout, 4, 8, 4, ' ', 0)
	defer w.Flush()
	for _, iface := range interfaces {
		addrs, err := iface.Addrs()
		if err != nil {
			fmt.Fprintf(w, "%s:\t%v\n", iface.Name, err)
			continue
		}
		if len(addrs) >= 1 {
			fmt.Fprintf(w, "%s:\t%s\n", iface.Name, addrs[0])
			for _, addr := range addrs[1:] {
				fmt.Fprintf(w, "\t%s\n", addr)
			}
		}
	}
}