Tell Git which SSH key to use for commits

config

## In ~/.ssh/config add:
host github.com
 HostName github.com
 IdentityFile ~/.ssh/<keyname>
 User git

shell.sh

## Create a new SSH key pair in the terminal
$ ssh-keygen -t rsa -b 4096 -C "dev@kyannerose.me"
> Generating public/private rsa key pair.
> Enter file in which to save the key (/home/j3nfain/.ssh/id_rsa): <keyname>
> Enter passphrase (empty for no passphrase): 
> Enter same passphrase again:

## Start SSH agent in background
$ eval "$(ssh-agent -s)"
> Agent pid 59566

## Add new key to SSH agent
$ ssh-add ~/.ssh/<keyname>

## Set permissions for SSH files used with GitHub
# SSH rejects keys that are too easily read
chmod 400 ~/.ssh/<keyname>

### See next file

shell2.sh

## Configure git's core.sshCommand globally
$ git config --global core.sshCommand "ssh -i ~/.ssh/<keyname> -F /dev/null"

## Configure git core.sshCommand per repo
$ cd repo
/repo$ git config core.sshCommand "ssh -i ~/.ssh/<keyname> -F /dev/null"
/repo$ git pull
/repo$ git push