Git

Git is widely used modern version control system originally developed in 2005 by Linus Torvalds.

1. Install Git on Linux¶

Type the following in the Terminal

sudo apt update 
sudo apt install git

sudo dnf update 
sudo dnf install git

Next we create our Git username and email which will be associated with any commits that we create later.

git config --global user.name "Ravi Roy"
git config --global user.email "ravieroy123@gmail.com"

git init <directory> : Create empty Git repo in specified directory. Run with no
arguments to initialize the current directory as a git repository
git clone <repo> : Clone repo located at <repo> onto local machine. Original repo can be located on the local filesystem or on a remote machine via HTTP or SSH.
git add <directory> : Stage all changes in <directory> for the next commit.
Replace <directory> with a <file> to change a specific file.
git commit -m "<message>" : Commit the staged snapshot, but instead of launching
a text editor, use <message> as the commit message.
git status : List which files are staged, unstaged, and untracked.
git log : Display the entire commit history using the default format.
git diff : Show unstaged changes between your index and working directory.
git pull <remote> : Fetch the specified remote’s copy of current branch and
immediately merge it into the local copy.

git revert <commit> : Create new commit that undoes all of the changes made in
<commit>, then apply it to the current branch.
git reset <file> : Remove <file> from the staging area, but leave the working directory
unchanged. This unstages a file without overwriting any changes.

git branch : List all of the branches in your repo. Add a branch argument to
create a new branch with the name branch
git checkout -b branch : Create and check out a new branch named branch.
Drop the -b flag to checkout an existing branch
git merge <branch> : Merge <branch> into the current branch.

Step 1 : Check status of what files are modified and added or deleted using git status

Step 2 : Add the files using git add fileName or the present working directory git add .

Step 3 : Commit the files using git commit -m "commit message"

Step 4 : Push the changes to GitHub repository by git push

For more detail, please refer to the cheatsheet by Atlassian, or read the PDF here.