Git + Tips and Tricks

Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency. Git is easy to learn and has a tiny footprint with lightning fast performance. ~ Git-SCM

Managing Multiple Git Repositories with Multiple Private Keys on the same Machine

1. Environment variable GIT_SSH_COMMAND:

GIT_SSH_COMMAND="ssh -i ~/.ssh/id_rsa_example" git clone example

Note that -i can sometimes be overridden by your config file, in which case, you should give SSH an empty config file, like this:

GIT_SSH_COMMAND="ssh -i ~/.ssh/id_rsa_example -F /dev/null" git clone example

2. Configuration core.sshCommand:

git config core.sshCommand "ssh -i ~/.ssh/id_rsa_example -F /dev/null"
git pull
git push

3. Global Configuration config file

1. Configure the ~/.ssh/config with different Hosts but same HostNames.
2. Clone your repo using the appropriate host.

Example:

Host work
 HostName github.com
 IdentityFile ~/.ssh/id_rsa_work
 User git

Host personal
 HostName github.com
 IdentityFile ~/.ssh/id_rsa_personal
 User git

And then try to access the repositories like this :

git clone git@work:username/my-work-project.git
git clone git@personal:username/my-personal-project.git

Removing Sensitive Data from Git Repository

Removing sensitive data from a repository - GitHub Docs