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commands.md

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+# Essential Commands — Docker
+
+Quick reference for common Docker operations.
+
+## Container Lifecycle
+
+```bash
+docker run -d --name app -p 8080:80 image    # start detached
+docker ps                                      # list running
+docker ps -a                                   # list all
+docker stop app && docker rm app              # cleanup
+docker logs -f app                            # follow logs
+docker exec -it app sh                        # shell into
+```
+
+## Image Management
+
+```bash
+docker build -t myapp:1.0 .                   # build
+docker images                                  # list
+docker pull nginx:alpine                       # fetch
+docker push registry/myapp:1.0                # publish
+docker rmi $(docker images -q --filter dangling=true)  # prune
+```
+
+## Compose
+
+```bash
+docker compose up -d                          # start stack
+docker compose down                           # stop & remove
+docker compose logs -f                        # follow all logs
+docker compose ps                             # stack status
+docker compose exec web sh                    # shell into service
+```
+
+## Cleanup
+
+```bash
+docker container prune                        # remove stopped
+docker image prune                            # remove dangling
+docker volume prune                           # remove unused (DESTRUCTIVE)
+docker system prune -a --volumes              # remove everything (DESTRUCTIVE)
+```