Generate new public key (or use existing) and copy to clipboard, to paste into GitHub

setup-github-key.sh

#!/bin/bash

# This is a simple script that sets up a public SSH key and copies it to the
# clipboard, so you can paste it into your GitHub account here:
# https://github.com/settings/keys
#
# It only handles the default public key name, id_rsa. Deal with it :D

# Check for existing public key
keys=`find ~/.ssh -type f -name 'id_rsa.pub'`

if [[ $keys == "" ]]; then
  ver=`sw_vers -productVersion`
  echo """
  You're running macOS version $ver. If that's greater than 10.2,
  you'll need to add this to ~/.ssh/config:
  
  Host *
    AddKeysToAgent yes
    UseKeychain yes
    IdentityFile ~/.ssh/id_rsa
  """

  # Public key does not exist. Create one.
  # Query for email address associated with github account
  echo "Please provide the email address associated with your GitHub account: "
  read email

  echo
  echo "Generating new SSH keys. Please accept the default name, id_rsa, if you want this to work."

  ssh-keygen -t rsa -b 4096 -C $email

  # Add it to the chain
  ssh-add -K ~/.ssh/id_rsa
fi

pbcopy < ~/.ssh/id_rsa.pub
echo "Public key copied to clipboard!"

# Direct to github
python -mwebbrowser https://github.com/settings/keys

# Party off.
exit 0