Automate uploading your public ssh key to a remote system authorized keys

sshauth.sh

#!/bin/bash

echo "-- Adds your id_rsa.pub to a remote system authorized keys --"
echo "Usage: $0 <user>@<host>"

if [ -z "$1" ]; then
  echo -n "User: "
  read user

  echo -n "Host: "
  read host

  userhost=$user@$host
else
  userhost=$1
fi

#echo "Userhost: $userhost"
cat ~/.ssh/id_rsa.pub | ssh $userhost "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"