#!/bin/sh -

# Any copyright is dedicated to the Public Domain.
# https://creativecommons.org/publicdomain/zero/1.0/

# Helper for dealing with incompatibility with Debian hostname:
# hostname: invalid option -- 'I'

# -I, --all-ip-addresses all addresses for the host

if [ x"$1" = x"-I" ]; then
    ip -o address show up scope global | \
        grep -Po '(?<=inet |inet6 )[^/]+' | \
        xargs echo
else
    exec /usr/bin/hostname "$@"
fi