The document discusses version control and provides an overview of Git, including what version control is, the different types of version control systems, the history and goals of Git, and basic Git concepts like the three stages that files can be in. It explains that Git is a distributed version control system created by Linus Torvalds to manage development on the Linux kernel as centralized systems were no longer sufficient for large open source projects.

1. Version Control with Git
By Sean McGary
http://seanmcgary.com/git

2. Agenda

3. Agenda
• What is Version Control?
• Types of Version Control
• History of Git
• Git Basics
• Live Demo

4. Version Control

5. Version Control
• What is Version Control?
• A system that records changes to files over time.
• Keeping track of changes allows you to.
• Revert the file, files, or the entire project to a previous state.
• Compare changes over time.
• See who modified the source last
• Allows for easy collaboration between between multiple people

6. Types of Version Control Systems

7. Types of Version Control Systems
• Local Version Control
• Simple as copying files to another directory
• Very prone to errors
• Works by keeping patch sets (diffs)
• RCS

8. Types of Version Control Systems

9. Types of Version Control Systems
• Centralized Version Control
• Hosted on a remote server
• Clients check out files, modify them, then push them back to the
server
• Popular CVCS’s
• CVS
• SVN

10. Types of Version Control Systems

11. Types of Version Control Systems
• Distributed Version Control Systems
• Designed to prevent the disasters possible with other VCS’s
• Clients don’t checkout single files, they clone the entire repository

12. The History of Git

13. The History of Git
• Originally created by Linus Torvalds in 2005
• Why was Git developed?
• Needed a home grown VCS to manage so many people making
many many changes.
• Bit Keeper was no longer free. Linus did not like this
• Goals of Git
• Speed
• Simplicity
• Strong support for non-linear development (Branches!!!)
• Fully distributed

14. Git Basics

15. Git Basics
• Snapshots, not Diffs
• Almost everything is local
• Cloned repository
• Offline productivity
• Integrity
• SHA-1 hash check-sums

16. The Three Stages/States

17. The Three Stages/States
• Three main states your files can reside in
• Modified
• Staged
• Committed
• Three stages
• Working directory
• Staging area
• Git directory

18. Basic Workflow

19. Basic Workflow