For the first part of this lab you will be using the terminal. However, you will not be using it to run code you have written or navigating directories. Instead you will be using the terminal to experimentally investigate properties of the Internet. When you type commands into the terminal you are interacting with the shell which is a program that processes your commands (like 'ls' and 'cd') and returns an output. Click on the image on the right to see a prominent featuring of a shell in a movie. Most parts of this lab require watching a short video, a small exercise, and discussing answers to posed questions. Please make sure to take the time to discuss high level concepts from the videos with your peers. There is no need to take extensive notes on the videos. The shell is a very powerful tool that takes decades to master. In this lab, we will therefore only glimpse at it. A simple, 10-minute introduction to the shell can be found here: Watch video now. While you do not need any particular command line skills in this lab, we recommend watching the video anyways to get an initial idea for typical shell usage beyond what you have experienced in the previous labs. A note: For this lab, we highly suggest refraining from the usage of the command rm -rf. It's highly powerful but can  render entire computer systems unusable or brick tablets and cellphones easily. Every system administrator has his or her own story to tell. Start your own shell now by opening terminal just like you have for the previous python labs. You can consult the videos below and go on to the next page. Note that this lab might not completely work under Windows. Start a shell on Linux Start a shell on Mac Start a shell on Windows

Thanks to code.org for this video!