Using multiple SSH keys with github

example ~/.ssh/config

Host github.com-work
	hostname github.com
	user git
	identityfile ~/.ssh/work-key

Host github.com-personal
	hostname github.com
	user git
	identityfile ~/.ssh/personal-key

Personal

git remote set-url origin git@github.com-personal:personal-account-org-name/project-name.git

git push -u origin

Work

git remote set-url origin git@github.com-work:work-account-org-name/project-name.git

git push -u origin