If you are setting up a new machine, first generate a key to the default `~/.ssh/id_rsa` by running:

```sh
  ssh-keygen -t rsa
  ssh-add ~/.ssh/id_rsa
```

Next, for each company account you have, run this command (substituting companyName to something more meaningful), which tags the key with companyName and saves it to ~/.ssh/companyName

```sh
  cd ~/.ssh
  ssh-keygen -t rsa -C "companyName" -f "companyName"
  ssh-add ~/.ssh/companyName
```

Open up the SSH config file:

```sh
  nano ~/.ssh/config
 ```