register a bunch of pubkeys with sshcommand. takes 1 arg, a filename where the file contains a username, followed by one or more ssh keys, each on its own line, followed by the next username, and so on

addkeys.sh

#!/usr/bin/env bash

name="";
key="";

while read line; do
  if [[ $line == ssh* ]]; then
    key=$line
    echo $key | sshcommand acl-add dokku $name
  else
    name=$line
  fi
done < $1