## Activity

 1. This is a seminar, and that means you should participate. But computers are
    weird and it's hard to show a room full of other people what you are doing.
    Even though we use them to chat all across the globe all the time.

 2. Fortunately, there are a few ways that work. For instance, a clever person
    in the late 70s wrote a very useful program called ‹script›. You can learn
    more about it by typing:
   
        $ man script

 3. Unfortunately, it doesn't play very nice with modern terminal programs.
    Instead, we will use a solution based on ‹tmux›, a terminal multiplexer.
    You can read about it in ‹man tmux› if you like.

 4. If you are asked, or you volunteer, to show how to solve a particular problem
    to your classmates, you can share your screen with the teacher like this:

        $ pb152 beamer

    If someone else is doing an exercise in your group, you can follow them
    on your own screen using:

        $ pb152 follow

    This will only work in your own group. If you are enrolled in a different
    seminar and visiting, you need to know the ‹xlogin› of the student at the
    board:

        $ pb152 follow --login xlogin

 5. Let's try that. Which means you have a chance to volunteer (unfortunately,
    this task is too easy to get you any points... perhaps next time). Your
    task will be to type this one command into the shared session:

        $ echo "Hello world!"

 6. When you are done, you can hit ctrl+d (we often write ^D to mean ctrl+d)
    or you can type:

        $ exit

Thank you (whoever you were) for participating. Let's move on to the next
part: some useful tricks with the shell. To continue, type:

        $ cat tricks.txt

PS: The summary of the commands to use for screen sharing is available in
    ‹~/pb152/00/activity.txt›. Please keep that file for future reference.
