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Git and GitHub Basics

Introduction
Install Git
Basic Commands
Code Editors
- VS-Code
- VS-Codium
References

Introduction

In this section, we cover basic commands and aspects of GitHub and Git.

Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

GitHub is a platform and cloud-based service for software development and version control using Git, allowing developers to store and manage their code.

Install Git

You can install git on MAC, Windows and Linux. You can consult Git's documentation learn how to install git.

Install on Linux

Fedora distribution
```
dnf install git-all
```
Debian-based distribution
```
apt install git-all
```
Click here for other Linux distributions

Install on MAC

With Homebrew
```
brew install git
```

Install on Windows

You can download Git for Windows at this link.

Basic Commands

Check Git version

git --version

Clone a repository

git clone <repository_url>

Clone a single branch

git clone <repository_url> --branch <branch> --single-branch <folder>

Check all available branches

git branch -r

Check the current branch

git branch

Go to another branch

git checkout <branch_name>

Add your changes to a local branch

Add all changes
```
git add .
```
Add changes of a specific file
```
git add <path_to_file>/<file_name>
```

Push changes of a local branch to the remote Github branch

To push changes to Github, you can use the following commands:

git add .

git commit -m "write your changes here in comment"

git push

Count the differences between two branches

Replace branch1 and branch2 with the appropriate branch names.

git rev-list --count branch1..branch2

See the default branch

git symbolic-ref refs/remotes/origin/HEAD | sed 's@^refs/remotes/origin/@@'

Force a push

git push --force

Merge a branch to a different branch

Checkout the branch you want to copy content TO
```
git checkout branch_name
```
Merge the branch you want content FROM
```
git merge origin/dev_mermaid
```
Push the changes
```
git push -u origin/head
```

Clone completely one branch to another branch locally then push the changes to Github

For this example, we copy branchB into branchA.

See available branches
```
git branch -r
```
Go to branchA
```
git checkout branchA
```
Copy branchB into branchA
```
git git reset --hard branchB
```
Force the push
```
git push --force
```

The 3 levels of the command reset

git reset --soft

Bring the History to the Stage/Index
Discard last commit

git reset --mixed

Bring the History to the Working Directory
Discard last commit and add

git reset --hard

Bring the History to the Working Directory
Discard last commit, add and any changes you made on the codes

Note 1: If you're using --hard, make sure to run git status to verify that your directory is clean, otherwise you will lose your uncommitted changes.

Note 2: The argument --mixed is the default option, so git reset is equivalent to git reset --mixed.

Reverse modifications to a file where changes haven't been staged yet

You can use the following to reverse the modifications of a file that hasn't been staged:

git checkout <filename>

Download binaries from Github

Template:

wget -O <file_name> https://raw.githubusercontent.com/<user_name>/<repository>/<path_to_file>/<file_name>

Resolve conflicts between branches

We show how to resolve conflicts in a development branch (e.g. branch_dev) and then merging the development branch into the main branch (e.g. branch_main).

Clone the repo
```
git clone <repo_url>
```
Pull changes and potential conflicts
```
git pull origin branch_main
```
Checkout the development branch
```
git checkout branch_dev
```
Resolve conflicts in a text editor
Save changes in the files
Add the changes
```
git add .
```
Commit the changes
```
git commit -m "your message here"
```
Push the changes
```
git push
```

Download all repositories of an organization

Clone all repositories. Replace with the organization in question.

gh repo list <organization> --limit 1000 | while read -r repo _; do
  gh repo clone "$repo" "$repo"
done

Revert a push commited with git

Find the commit ID
```
git log -p
```
Revert the commit
```
git revert <commit_ID>
```
Push the changes
```
git push
```

Make a backup of a branch

git clone -b <branch_name> --single-branch /<path_to_repo>/<repo_name>.git

Revert to a backup branch

Checkout the branch you want to update (branch)
```
git checkout <branch>
```
Do a reset of your current branch based on the backup branch
```
git reset --hard <backup_branch>
```

Start over local branch and pull remote branch

To start over your local branch and pull the remote branch to your working environment, thus ignoring local changes in the branch, you can do the following:

git fetch
git reset --hard
git pull

Note that this will not work for untracked and new files. See below for untracked and new files.

Overwrite local files and pull remote branch

This method can be used to overwrite local files. This will work even if you have untracked and new files.

Save local changes on a stash
```
git stash --include-untracked
```
Discard local changes
```
git reset --hard
```
Discard untracked and new files
```
git clean -fd
```
Pull the remote branch
```
git pull
```

Then, to delete the stash, you can use git stash drop.

Stash command and parameters

The stash command is used to record the current state of the working directory.

Stash a branch (equivalent to git stash push)
```
git stash
```
List the changes in the stash
```
git stash list
```
Inspect the changes in the stash
```
git stash show
```
Remove a single stashed state from the stash list and apply it on top of the current working tree state
```
git stash pop
```
Apply the stash on top of the current working tree state without removing the state from the stash list
```
git stash apply
```
Drop a stash
```
git stash drop
```

Code Editors

There are many code editors that can work well when working with git.

VS-Code

VS-Codeis a source-code editor made by Microsoft with the Electron Framework, for Windows, Linux and macOS.

To download VS-Code, visit their website and follow the given instructions.

VS-Codium

VS-Codium is a community-driven, freely-licensed binary distribution of Microsoft’s editor VS Code.

There are many ways to install VS-Codium. Visit the official website for more information.

Install on MAC
```
brew install --cask vscodium
```
Install on Linux
```
snap install codium --classic
```
Install on Windows
```
choco install vscodium
```

References

Git Documentation - https://git-scm.com/docs/user-manual

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