Contents

1. Git
2. Why Git ?
3. Installation and Configuration Settings
4. Existing project to Git Repository
5. Commit
6. Clone and Push a repository
7. Create a branch for Issues, Push, Merge, Delete a repository after commit

1. Git

Git is a Open-Source distributed control system to manage changes to source code. It was developed by Linus Torvalds.

2. Why Git?

Most widely used control system in the world. It keeps track of all the modification to the code. Mistakes or error in source code can be overcome by looking at the previous changes.
And Git repository hosting service i.e., Gitlab, Mercury, GitHub few more.

3a. Installation

• GNU/Linux Users

   sudo apt-get install git    or
   sudo add-apt-repository ppa:git-core/ppa
   sudo apt update
   sudo apt install git
  

• Windows Users
  

  Download from link : www.git-scm.com/downloads
  Select OS and 32bit or 64bit based on your requirement.
  

3b. Configuration & Production of SSH key

Configuring

git config --global user.name "UserName"
git config --global user.email "UserName@gmail.com"
git config --list

git config --help #For manual page or help page

Production of SSH Key

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
eval $(ssh-agent -s)
ssh-add ~/.ssh/id_rsa

• GNU\Linux User :

xclip -sel clip <~/.ssh/id_rsa.pub

• Windows User :

Copy id_rsa.pub content by going to C drive -> User -> UserAccount -> .ssh

4. Existing project to Git Repository

Navigate to project folder from terminal

• To Git file will be created if the command was executed correctly

  git init

• staging area : The directory we use to organize files that are tracked and committed before pushing it to the repo.

  git status

• To add all files & To add a single file

  git add -A git add filename

• To remove all files & To Remove files from staging area :

  git reset git reset filename
  

5. Commit

• To commit

  git commit -m “First Commit” #-m is message passed

• To can view our commits

  git log
  

6. Clone and Push a repository

To track an existing repo

• git clone

  Example :

  mkdir first git clone ls -la #Shows all files in directory git diff #shows any changes made git add -A git commit -m "Updated first commit"

If several people are working on a single project

• locations where our repo will get external commit or push

  git remote -v

• list all git branches

  git branch -a

• pull changes from remote repo

  git pull origin master

• pushes changes to remote repo i.e., master branch

  git push origin master

  
  

7. Create a branch for Issues, Push, Merge, Delete a repository after commit

Branch : Usually a developer will create his/her own branch then add things or report.

git branch <branch name> 

• shows all branches

  git branch

• switches branch<br> <br>

  git checkout

• Example : same example… make some changes in file and then
  

  git add -A git commit -m “Update 2”

Push :

• Origin is the name of and followed by branch name

  git push -u origin git branch -a

Merge :

git checkout master 
git pull origin master
git branch --merged
git merge <branch name>
git push origin master

Delete :

git branch --merged

#delete in directory
git branch -d <branch name>

git branch -a
git push origin --delete <branch name>
git branch -a