#!/bin/bash
set -eu
pname="$(basename "$0")"
if [ $# -ne 1 ] ; then
    printf "%s usage:\n\n\t%s user@host\n\n" "$pname" "$pname"
    exit 1
fi
userhost="$1"

pubkeys=(~/.ssh/id*.pub)
if [[ ${#pubkeys[@]} -eq 0 ]] ; then
    printf '%s: could not find a public key in ~/.ssh/ ;\n%s: please use ssh-keygen or ssh-generate-keys first.\n' "$pname" "$pname"
    exit 2
fi

cat "${pubkeys[@]}" | ssh -x -T "$userhost" bash -c "'mkdir -p ~/.ssh ; cat >> ~/.ssh/authorized_keys'"