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Useful Commands

Linux Commands

Navigation and File Management

  • pwd - Print Working Directory: Displays the current directory path.
  • ls - List: Lists files and directories in the current directory.
  • cd <directory> - Change Directory: Navigates to the specified directory.
  • mkdir <directory> - Make Directory: Creates a new directory.
  • rmdir <directory> - Remove Directory: Deletes an empty directory.
  • rm <file> - Remove: Deletes a file.
  • rm -r <directory> - Remove Recursively: Deletes a directory and its contents.
  • cp <source> <destination> - Copy: Copies files or directories.
  • mv <source> <destination> - Move: Moves or renames files or directories.
  • touch <file> - Touch: Creates an empty file or updates the timestamp of an existing file.
  • nano <file> - Nano Editor: Opens the Nano text editor to edit a file.

System Information

  • uname -a - Print System Information: Displays detailed information about the system.
  • df -h - Disk Free: Shows disk space usage in a human-readable format.
  • du -sh <directory> - Disk Usage: Shows the size of a directory and its contents.
  • top - Task Manager: Displays running processes and system resource usage.
  • ps aux - Process Status: Lists all running processes.
  • free -h - Free Memory: Displays free and used memory in a human-readable format.

Networking

  • ifconfig - Interface Configuration: Displays network interface configuration.
  • ping <hostname> - Ping: Checks connectivity to a host.
  • netstat -tuln - Network Statistics: Lists open ports and listening services.
  • curl <url> - Curl: Transfers data from or to a server using various protocols.

Package Management

  • sudo apt update - Update Package List: Updates the list of available packages.
  • sudo apt upgrade - Upgrade Packages: Upgrades all installed packages to their latest versions.
  • sudo apt install <package> - Install Package: Installs the specified package.
  • sudo apt remove <package> - Remove Package: Removes the specified package.
  • sudo apt autoremove - Auto Remove: Removes unused packages.

Docker Commands

Basic Commands

  • docker --version - Docker Version: Displays the installed Docker version.
  • docker pull <image> - Pull Image: Downloads an image from Docker Hub.
  • docker build -t <name> . - Build Image: Builds an image from a Dockerfile in the current directory and tags it with the specified name.
  • docker run <image> - Run Container: Runs a container from the specified image.
  • docker ps - List Containers: Lists running containers.
  • docker stop <container_id> - Stop Container: Stops a running container.
  • docker rm <container_id> - Remove Container: Deletes a stopped container.
  • docker image list - List Images: Lists all Docker images on the system.
  • docker rmi <image_id> - Remove Image: Deletes the specified image.

Advanced Commands

  • docker exec -it <container_id> bash - Execute Command: Opens an interactive terminal session inside a running container.
  • docker logs <container_id> - Logs: Displays logs from a running container.
  • docker-compose up - Docker Compose Up: Starts services defined in a docker-compose.yml file.
  • docker-compose down - Docker Compose Down: Stops services defined in a docker-compose.yml file.
  • docker volume ls - List Volumes: Lists all Docker volumes.
  • docker network ls - List Networks: Lists all Docker networks.
  • docker inspect <container_id> - Inspect Container: Displays detailed information about a container.

ROS Commands

Basic Commands

  • ros2 --help - Help: Displays help information for ROS 2 commands.
  • ros2 topic list - List Topics: Lists all active topics.
  • ros2 topic echo <topic> - Echo Topic: Displays messages published to the specified topic.
  • ros2 topic pub <topic> <msg_type> <msg> - Publish Topic: Publishes a message to a topic.
  • ros2 node list - List Nodes: Lists all active nodes.
  • ros2 node info <node_name> - Node Info: Displays information about a specific node.

Package and Workspace Management

  • ros2 pkg create <package_name> - Create Package: Creates a new ROS 2 package.
  • colcon build - Build Workspace: Builds the ROS 2 workspace.
  • source <workspace>/install/setup.bash - Source Workspace: Sources the setup file to overlay the workspace on the environment.

Launching and Running Nodes

  • ros2 run <package_name> <executable> - Run Node: Runs a node from a specified package.
  • ros2 launch <package_name> <launch_file> - Launch: Launches nodes and configurations specified in a launch file.

Service and Parameter Commands

  • ros2 service list - List Services: Lists all active services.
  • ros2 service call <service> <srv_type> <args> - Call Service: Calls a service with specified arguments.
  • ros2 param list - List Parameters: Lists all parameters for a node.
  • ros2 param set <node> <param_name> <value> - Set Parameter: Sets a parameter value for a node.

Additional Tools

  • rviz2 - RViz: Launches the RViz visualization tool.
  • rqt - RQt: Launches the RQt graphical user interface tool.