create different ssh key according the article Mac Set-Up Git
$ ssh-keygen -t rsa -C "[email protected]"
Please refer to github ssh issues for common problems.
for example, 2 keys created at:
~/.ssh/id_rsa_1
~/.ssh/id_rsa_2
then, add these two keys as following
$ ssh-add ~/.ssh/id_rsa_1
$ ssh-add ~/.ssh/id_rsa_2
you can delete all cached keys before
$ ssh-add -D
finally, you can check your saved keys
$ ssh-add -l
$ cd ~/.ssh/
$ touch config
$ subl -a config
Then added
#1st account
Host [Host Identifier for id_rsa_1]
HostName github.com
User git
IdentityFile ~/.ssh/id_rsa_1
#2nd account
Host [Host Identifier for id_rsa_2]
HostName github.com
User git
IdentityFile ~/.ssh/id_rsa_2
Then make sure the remote ssh url of related repo is git@[Host Identifier in .ssh/config]:[Owner]/[Repo].git