I have a GitHub account, it is oanhnn, but at office, I couldn't use my personal GitHub account. I have to use an other GitHub account, eg supermen. I want use both two accounts on same computer (use without typing password each times, when git push or pull).

Using ssh keys and ssh config file to create an alias host and use multiple GitHub accounts

1. Make key pair for each accounts and add it to GitHub accounts.

2. Make ssh configure file (~/.ssh/config) like:

   # Default github account: oanhnn
   Host github.com
      HostName github.com
      IdentityFile ~/.ssh/oanhnn_private_key
      IdentitiesOnly yes
      
   # Other github account: supermen
   Host github-supermen
      HostName github.com
      IdentityFile ~/.ssh/supermen_private_key
      IdentitiesOnly yes
   

3. Added ssh key to your agent by command:

   $ ssh-add ~/.ssh/oanhnn_private_key
   $ ssh-add ~/.ssh/supermen_private_key
   

4. Check that repo recognizes keys.

   $ ssh -T git@github.com
   $ ssh -T git@github-supermen
   

5. Clone projects

   $ git clone git@github-supermen:org2/project2.git /path/to/project2
   $ cd /path/to/project2
   $ git config user.email "supermen@org2.com"
   $ git config user.name  "Super Men"
   

Done! Have goodluck!