ssh - sgml/signature GitHub Wiki

https://medium.com/@trionkidnapper/ssh-keys-with-multiple-github-accounts-c67db56f191e

https://medium.com/@xiaolishen/use-multiple-ssh-keys-for-different-github-accounts-on-the-same-computer-7d7103ca8693

https://blog.tinned-software.net/generate-public-ssh-key-from-private-ssh-key/

https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys-on-ubuntu-1604

https://www.redhat.com/sysadmin/passwordless-ssh