#!/bin/bash

accounts=( \
	somehost.example.com \
	someotherhost.example.com \
	someuser@example.com
)

# e.g. prefix='from="myhost" '
prefix=''

auth_key_file=$HOME/.ssh/new_authorized_keys_file

echo "# Auto generated authorized_keys file" > $auth_key_file
echo "# $(date -R)" >> $auth_key_file

# list of keys that i authorize
echo "$prefix$(cat $HOME/.ssh/id_rsa.pub)" >> $auth_key_file

command="
	cat - > ~/.ssh/authorized_keys
	chmod 600 ~/.ssh/authorized_keys
	[[ -f ~/.ssh/authorized_hosts ]] && rm ~/.ssh/authorized_hosts
	[[ -f ~/.ssh/authorized_keys2 ]] && rm ~/.ssh/authorized_keys2
"

for account in ${accounts[@]}; do
	echo Changing keys for $account
	ssh \
		$account \
		"$command" \
		< $auth_key_file
done

rm $auth_key_file