Git History

• Every Change moved from staging Area to Local Repo is called as COMMIT.
• Every Commit has an ID
• using GIT you can move to any commit in history.
• Lets Define HEAD. HEAD is pointer which points to commit id working tree is looking at.
• Lets try to move the HEAD to Third commit. For that you need commit id. Commit id which can be used are long and short

git log
git log --oneline

• Now Lets move the HEAD to Third Commit

git checkout 7907137

• Now to move the HEAD back to latest commit

git checkout master

Revert the modified changes in the Working Tree

• Make changes to 6.txt and add some content.
• To revert the changes from the working tree on this file

git checkout -- 6.txt

Git Branches

• The default branch of git is master
• Now lets try to create some branches.

mkdir ecommerceapp
cd ecommerceapp
git init

• Now lets create basic folder structure

mkdir src
mkdir test
mkdir docs
touch Readme.md
touch src/main.py
touch test/main.py
touch docs/main.md

• Now commit these changes

git add -A
git commit -m "Initial Folder Structure Created"

• Now this ecommerce application development is agile, We need create the branches for sprints. For now we need to create a branch called as sprint-1

git branch sprint-1
git branch 
git checkout sprint-1

• To create a branch called sprint-1 and move the head to sprint-1

git checkout -b sprint-1

• Sprint-1 Developement has made some commits

echo "Sprint 1 Started" >> src/main.py
git add .
git commit -m " Feature 1 completed"

echo "Sprint 1 Started Testing" >> test/main.py
git add .
git commit -m "Feature 2 completed"

git log

• Now checkout to master branch and then back to sprint-1

git checkout master
git checkout sprint-1