# Option 1: Xcode Command Line Tools (simplest)
xcode-select --install
git --version

# Option 2: Homebrew (keeps it updated)
brew install git
git --version

sudo apt update && sudo apt install git -y
git --version   # git version 2.x.x

git --version

sudo yum install git -y
git --version

# Set your identity (used in every commit)
git config --global user.name "Your Name"
git config --global user.email "you@example.com"

# Set default branch name to main
git config --global init.defaultBranch main

# Set your preferred editor (choose one)
git config --global core.editor vim
git config --global core.editor "code --wait"   # VS Code
git config --global core.editor nano

# Verify settings
git config --list

# Generate SSH key
ssh-keygen -t ed25519 -C "you@example.com"
# Press Enter 3 times (accept defaults)

# Copy your public key
cat ~/.ssh/id_ed25519.pub
# Copy the entire output

# Add to GitHub:
# Settings → SSH and GPG keys → New SSH key → Paste

# Test the connection
ssh -T git@github.com
# "Hi username! You've successfully authenticated."

# Create new repo
mkdir my-project && cd my-project
git init
echo "# My Project" > README.md
git add README.md
git commit -m "first commit"

# Push to GitHub (create repo on github.com first)
git remote add origin git@github.com:yourusername/my-project.git
git push -u origin main

# Clone an existing repo
git clone git@github.com:yourusername/my-project.git
cd my-project

git init test-repo && cd test-repo
echo "hello" > file.txt
git add . && git commit -m "test"
git log --oneline
# Output: abc1234 test
cd .. && rm -rf test-repo