Slides used in workshop titled "Grokking Opensource with Github", conducted by GDSC CIT.

1. Grokking Opensource
with Github
Sumit Anand

2. Grokking Opensource
with Github
Harish Prasad

3. VCS
There are a number of Version Control Systems out
there. This alone should prove that version control is
incredibly important. Three of the most popular
version control systems are:
Git
Subversion
Mercurial

4. Version Control Is
Everywhere

5. Terminology

6. Linux
Installing Git
Debian/Ubuntu
For the latest stable version for your release of Debian/Ubuntu
# apt-get install git

7. For Other Operating Systems
Installing Git
https://git-scm.com/downloads

8. # sets up Git with your name
git config --global user.name "<Your-Full-Name>"
# sets up Git with your email
git config --global user.email "<your-email-address>"
# makes sure that Git output is colored
git config --global color.ui auto
# displays the original state in a conflict
git config --global merge.conflictstyle diff3
git config --list
Configuring Git

9. Atom Editor Setup
git config --global core.editor "atom --wait"
Sublime Text Setup
git config --global core.editor "'/Applications/Sublime Text 2.app/Contents/SharedSupport/bin/subl' -n
-w"
VSCode Setup
git config --global core.editor "code --wait"
Git Code Editor

10. Create A Repo From Scratch
git init
Sets up all of the necessary files and directories that Git will use to keep
track of everything.
.git (directory)
WARNING: Don't directly edit any files inside the .git directory. This is the heart of the repository. If you
change file names and/or file content, git will probably lose track of the files that you're keeping in the
repo, and you could lose a lot of work! It's okay to look at those files though, but don't edit or delete them.

11. .Git Directory Contents
• config file
• description file
• hooks directory
• info directory
• objects directory
• refs directory

12. “To make an identical copy”
● Let’s try cloning an existing project? Let's see how Git's clone command
work.
● https://github.com/anandsumit2000/18CSMP68
Cloning

13. Determine A Repo's Status
git status
On branch master
No commits yet
nothing to commit, working directory clean
Explanation
1
2
3

14. Displaying A Repository's Commits
● The Git Log Command
● The Secure Hash Algorithm (SHA) hash for the commit
● The author of the commit
● The date the commit was pushed.
● The message associated with the commit

15. Adding Files to Stage
● The Git Add Command
●The git add command adds a file to the Git staging area.
This area contains a list of all the files you have recently changed.
Your repository will be updated the next time you create a commit with your changes.
Therefore, running the git add command does not change any of your work in the Git repository.

16. To make a commit in Git you use the git commit command,
Make A Commit

17. Commit Messages
How do I write a good commit message? And why should I care?

18. (Branch,checkout,merge)
Branches store different versions of your project
List, create, or delete branches
• Parallel development
• Implement new features
• Fix bugs
Branches

19. • Try out something
• Main branch = master
• By default created at initialization
• Usually development is done on other (feature)
branches
Create new branch : git branch <branch_name>
List all branches of local repository : git branch
Delete branch : git branch -d <branch_name>

23. Switch between existing branches : git checkout
<branch_name>
git checkout

24. Merge changes in checked out branch
Join two or more development histories together
git merge <feature_branch>
git merge

26. Reapply commits on top of another base tip
git rebase <feature_branch>
git rebase

28. Squashing means to combine multiple commits into one.
git rebase -i Head~(no_of_commits)
squashing