#!/usr/bin/env bash

getnics () {
  while IFS= read -r line; do
    echo ${line%% *}
  done < <(ip --br -4 a)
}


# complete -W "$(ips)" ips
if [ -z "$1" ]; then
  getnics
  exit 0
fi

for i in "$1";do
    m=$(ip --br -4 a s "$1"); m=${m%\/*}; echo ${m##* }
done