Importing source code to GitHub
You can import repositories to GitHub using the command line or external migration tools.
Importing a Git repository using the command line
Importing Git projects using the command line is suitable when your existing code is hosted on a private network.
Adding an existing project to GitHub using the command line
Putting your existing work on GitHub Enterprise can let you share and collaborate in lots of great ways.
Source code migration tools
You can use external tools to move your projects to GitHub.