Set up another git user with ssh

multiple-git-user-ssh.rst

1. Generate new ssh key pair

   ssh-keygen -t rsa -b 4096 -C "iam@here.com"

2. Give it a different name than default, e.g. id_rsa_iam.

3. Add this key to the ssh agent, cd ~/.ssh and ssh-add id_rsa_iam

   If you get the error 'Could not open a connection to your authentication agent.' then start the ssh-agent with

   eval `ssh-agent -s`
   ssh-add

4. Modify the ssh config: touch config (still in ~/.ssh) and put this into it:

   Host github.com
       HostName github.com
       User git
       IdentityFile ~/.ssh/id_rsa
   
   # Github when impersonating Iam
   Host iam.github.com # can be anything, e.g. github-iam
       HostName github.com
       User git
       IdentityFile ~/.ssh/id_rsa_iam

5. Add the public key to your GitHub account as usual.

6. Clone a repo using the new host:

   git clone git@iam.github.com:iam/repohere.git

7. Go into the repo directory and set new user name and email:

   git config user.name "Iam Here"
   git config user.email "iam@here.com"

This manual was adapted from StackOverflow.