bash <(curl -# -L https://gist.github.com/amercier/68c00638299adb362220/raw) <host>

ssh-passwordless.sh

#!/usr/bin/env bash

if [ "$1" == "" ]; then
  echo "Syntax: $0 HOST" >&2
  exit 1
fi

if [ ! -e ~/.ssh/id_rsa.pub ]; then
  echo "Generating private/public keys..."
  ssh-keygen -t rsa || exit 1
else
  echo "Found public key ~/.ssh/id_rsa.pub, no need to generate it"
fi

echo "Sharing public key with $1..."
ssh "$1" mkdir -p .ssh \
&& cat ~/.ssh/id_rsa.pub | ssh "$1" 'cat >> .ssh/authorized_keys'