Linux & Git-GitHub Cheat Sheet

🚀 Linux Commands

🔹 Basic Commands

• pwd → Print working directory.

• ls → List files in a directory.

• cd <directory> → Change directory.

• mkdir <directory> → Create a new directory.

• rmdir <directory> → Remove an empty directory.

• rm <file> → Remove a file.

• rm -r <directory> → Remove a directory with files.

🔹 File Operations

• touch <file> → Create an empty file.

• cp <source> <destination> → Copy a file/directory.

• mv <source> <destination> → Move or rename a file/directory.

• cat <file> → View file contents.

• nano <file> → Edit a file using Nano editor.

• vim <file> → Edit a file using Vim editor.

🔹 File Permissions

• chmod <permissions> <file> → Change file permissions.

• chown <user>:<group> <file> → Change file ownership.

• ls -l → Show file permissions.

🔹 Process Management

• ps → Show running processes.

• top → Display real-time system processes.

• kill <PID> → Kill a process by its PID.

• htop → Interactive process monitoring (if installed).

🔹 System Information

• uname -a → Show system info.

• df -h → Show disk usage.

• free -m → Show memory usage.

• uptime → Show system uptime.

• whoami → Show current user.

🔹 Networking

• ifconfig / ip a → Show network interfaces.

• ping <host> → Check network connectivity.

• curl <URL> → Fetch data from a URL.

• wget <URL> → Download a file from a URL.

🔹 Package Management

• sudo apt update && sudo apt upgrade -y → Update and upgrade system packages (Debian-based).

• sudo yum update -y → Update system packages (RHEL-based).

• apt install <package> → Install a package.

• apt remove <package> → Remove a package.

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🛠 Git & GitHub Commands

🔹 Git Basics

• git init → Initialize a Git repository.

• git clone <repo_url> → Clone a repository.

• git status → Check status of the working directory.

• git add <file> → Stage changes.

• git commit -m "message" → Commit staged changes.

• git push origin <branch> → Push commits to remote.

• git pull origin <branch> → Pull latest changes.

• git log --oneline → Show commit history in short form.

🔹 Branching

• git branch → List all branches.

• git branch <branch_name> → Create a new branch.

• git checkout <branch_name> → Switch to a branch.

• git merge <branch_name> → Merge a branch.

• git branch -d <branch_name> → Delete a branch.

🔹 Undo Changes

• git reset --soft HEAD~1 → Undo last commit (keep changes).

• git reset --hard HEAD~1 → Undo last commit (discard changes).

• git revert <commit_hash> → Revert a commit safely.

🔹 GitHub Collaboration

• git remote add origin <repo_url> → Connect to a remote repository.

• git push -u origin <branch> → Push branch to GitHub.

• git pull origin <branch> → Pull latest changes from GitHub.

• git fetch → Fetch latest updates from remote.

• git clone <repo_url> → Clone a repository from GitHub.

Tips

🚀 Master these commands and boost your DevOps productivity! 💻🔥