git diff: View file changes not yet staged.
git status: See the current state of the working directory and staging area.
git log --stat: Review commit history with statistics.
git show <commit_id>: Display details of a specific commit.

git add <file_path>: Stage specific files for commit.
git commit -a -m "message": Commit all tracked changes with a message.
git commit --amend: Modify the last commit.
git stash: Temporarily save changes.
git stash pop: Reapply stashed changes.

git reset HEAD~1: Undo the last commit but keep changes.
git reset: Move branch pointer and optionally keep or discard changes.
git reset --soft HEAD^: Undo the last commit, keeping staged changes.
git reset --hard: Completely discard changes and commits.
git revert <commit_id>: Create a new commit that undoes a previous one.

git branch: List local branches.
git branch -D <branch_name>: Force delete a branch.
git checkout -b <branch_name>: Create and switch to a new branch.
git checkout <branch_name>: Switch to an existing branch.
git branch --set-upstream-to <remote_branch>: Track a remote branch.

git cherry-pick <commit_id>: Apply changes from a specific commit.
git rebase -i: Interactively rewrite commit history.
git rebase <branch_name>: Rebase onto another branch.

git clone <url>: Clone a remote repository locally.
git fetch: Download changes without merging.
git pull: Fetch and merge remote changes.
git push origin <branch_name>: Push local branch to remote.

git merge <branch_name>: Merge another branch into the current one.

docker --version             # Check Docker version
docker info                  # Show Docker system-wide info
docker help                  # Get help with Docker CLI

docker build -t myapp .      # Build image from Dockerfile
docker pull nginx            # Download image from Docker Hub
docker images                # List local images
docker rmi image_id          # Remove an image

docker run -it ubuntu              # Run interactive container
docker run -d nginx                # Run container in detached mode
docker ps                          # List running containers
docker ps -a                       # List all containers
docker stop container_id          # Stop a container
docker start container_id         # Start a stopped container
docker rm container_id            # Remove a container

docker volume create myvol
docker run -v myvol:/data ubuntu   # Mount volume
docker run -v $(pwd):/app ubuntu   # Bind mount current dir

docker exec -it container_id bash  # Access running container shell
docker logs container_id           # View container logs

FROM node:18-alpine
WORKDIR /app
COPY . .
RUN npm install
CMD ["node", "index.js"]

kubectl version                 # Show client/server version
kubectl config view             # View kubeconfig
kubectl cluster-info            # Show cluster endpoints
kubectl get nodes               # List cluster nodes

kubectl get pods                # List all pods
kubectl get deployments         # List deployments
kubectl get svc                 # List services
kubectl create -f app.yaml      # Create resources from YAML
kubectl apply -f app.yaml       # Apply changes (create/update)
kubectl delete -f app.yaml      # Delete resources

kubectl describe pod mypod              # Inspect pod
kubectl logs mypod                      # View pod logs
kubectl exec -it mypod -- /bin/bash     # Access pod shell

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  replicas: 2
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: app
        image: myimage:latest
        ports:
        - containerPort: 80