Passwordless SSH Function - inject your ssh key into a server without actually typing your password in; lastpass does that for you!

ssh.sh

# Works with Bash and ZSH
# Copy this into your ~/.bashrc or ~/.zshrc
# Install Lastpass cli -- https://github.com/lastpass/lastpass-cli
# Install sshpass
#   OSX: $ brew install http://git.io/sshpass.rb
# Be sure to change <MYLASTPASS-PASSWORD-ID> in the install_keys() function
function install_keys (){
  echo "INFO: No SSH Key on server. Grabbing password from lastpass"
  export SSHPASS=$(lpass show <MYLASTPASS-PASSWORD-ID> --password)
  /usr/local/bin/sshpass -e ssh-copy-id $1 || return 255
  unset SSHPASS
}

function ssh (){
  # Requires a server parameter
  if [[ -z $1 ]]; then
    echo "You didn't specify a server"
    return 255
  fi

  # Check if key is installed, exit afterwards if successful to avoid duplicate
  # ssh commands being executed when you log out of the target ssh server
  /usr/bin/ssh -qo PasswordAuthentication=no $1 exit
  if [[ $? != 0 ]]; then
    install_keys $1
  fi

  # Finally, SSH into the server
  /usr/bin/ssh -qo PasswordAuthentication=no $1
}