As DevOps engineers, proficiency in Linux and Git-GitHub is essential for managing and deploying code efficiently. With the vast array of commands and functionalities these tools offer, having a well-organized cheat-sheet can be a game-changer. Today, I’m sharing a comprehensive cheat-sheet covering essential Linux commands, Git commands, and GitHub tips that every DevOps professional should have in their toolkit.

Linux Commands Cheat-Sheet File

Directory Management

ls List directory contents.

ls

cd [directory] Change the current directory.

cd /path/to/directory

pwd Print the current working directory.

pwd

mkdir [directory] Create a new directory.

mkdir new-directory

rmdir [directory] Remove an empty directory.

rmdir old-directory

rm [file] Remove a file.

rm file-to-remove.txt

cp [source] [destination] Copy files or directories.

cp source-file.txt destination-file.txt

mv [source] [destination] Move or rename files or directories.

mv old-name.txt new-name.txt

touch [file] Create an empty file or update the timestamp of an existing file.

touch new-file.txt

File Viewing & Editing

cat [file] Concatenate and display file content.

cat file-to-view.txt

less [file] View file content page by page.

less file-to-view.txt

head [file] Display the first 10 lines of a file.

head file-to-view.txt

tail [file] Display the last 10 lines of a file.

tail file-to-view.txt

nano [file] Edit a file using the Nano text editor.

nano file-to-edit.txt

vim [file] Edit a file using the Vim text editor.

vim file-to-edit.txt

Permissions & Ownership

chmod [permissions] [file] Change file permissions.

chmod 755 file-to-change-permissions.txt

chown [owner]:[group] [file] Change file owner and group.

chown user:group file-to-change-owner.txt

ls -l List files with detailed information including permissions and ownership.

ls -l

System Monitoring & Management

top Display active processes.

top

ps aux List all running processes.

ps aux

df -h Display disk space usage.

df -h

du -sh [directory] Display disk usage of a directory.

du -sh /path/to/directory

free -h Display memory usage.

free -h

uptime Show system uptime and load averages.

uptime

Git Commands Cheat-Sheet Basic Commands

git init Initialize a new Git repository.

git init

git clone [url] Clone a repository from a URL.

git clone https://github.com/user/repo.git

git add [file] Add a file to the staging area.

git add file-to-add.txt

git commit -m "[message]" Commit changes with a message.

git commit -m "Commit message"

git status Show the status of changes.

git status

git log Display commit history.

git log

Branching & Merging

git branch List all branches.

git branch

git branch [branch_name] Create a new branch.

git branch new-branch

git checkout [branch_name] Switch to a branch.

git checkout new-branch

git merge [branch_name] Merge a branch into the current branch.

git merge new-branch

git rebase [branch_name] Rebase the current branch onto another branch.

git rebase new-branch

Stashing

git stash Temporarily save changes without committing.

git stash

git stash pop Apply stashed changes and remove them from the stash.

git stash pop

git stash list List all stashed changes.

git stash list

git stash drop Remove a specific stash.

git stash drop stash@{0}

git stash clear Remove all stashes.

git stash clear

Cherry-Picking

git cherry-pick [commit_hash] Apply a specific commit from another branch.

git cherry-pick 123abc456def

Conflict Resolution

git status Show files with conflicts.

git status

git diff Show differences between conflicting versions.

git diff

git add [file] Stage resolved files for commit.

git add resolved-file.txt

GitHub Tips Cheat-Sheet Repository Management

Create a Repository Click "New" on GitHub and follow the prompts.
Fork a Repository Click "Fork" on the top-right of the repository page.
Clone a Repository Use git clone [url] to copy a repository locally.

git clone https://github.com/user/repo.git

Collaboration

Pull Requests Create a pull request to propose changes. Review and discuss before merging.
Issues Use GitHub Issues to track bugs, tasks, and feature requests.
Wiki Utilize the GitHub Wiki for project documentation. Branch Protection
Enable Branch Protection Prevent force-pushes and require pull request reviews before merging.

GitHub Actions

Set Up CI/CD Create workflows using .github/workflows to automate build, test, and deployment processes.

Day 12 of 90 Days of DevOps Challenge: A Comprehensive Linux and Git Cheat-Sheet for DevOps Engineers

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