Generate ssh keys for a new machine

ssh-keys.sh

#!/bin/bash
mkdir ~/.ssh

touch ~/.ssh/authorized_keys
touch ~/.ssh/known_hosts

cat <<EOF > ~/.ssh/config
Host *
    User ${USER}
    IdentityFile ~/.ssh/host.key

Host github.com
    HostName github.com
    User git
    IdentitiesOnly yes
    IdentityFile ~/.ssh/github.key

EOF

ssh-keygen -t rsa -b 4096 -N '' -f ~/.ssh/host.key
ssh-keygen -t rsa -b 4096 -N '' -f ~/.ssh/github.key

# Set permissions
chmod 700 ~/.ssh
chmod 644 ~/.ssh/*
chmod 600 -f ~/.ssh/*.key