#!/bin/bash

cd "${0%/*}/.."

rm -rf --one-file-system out
mkdir out

for host in hosts/*; do
  [ "${host#*/}" = 'all' ] && continue

  cat "${host}" "hosts/${host#*@}" 'hosts/all' \
  2>/dev/null \
  | sed '
    s@^@pubkeys/@
    s@$@.pub@
  ' \
  | xargs -r cat
  >"out/${host}.authorized_keys"
done