## Exercise 1

 1. You can volunteer to do this exercise ‘at the blackboard’. You may want to
    review the instructions here:¹
    
        $ cat ../00/activity.txt

 2. Perform the following tasks (using commands you already know):
    
    ◦ change into the directory ‹pb152› in your home: ‹~/pb152›
    ◦ list the contents of the directory
    ◦ create a directory called ‹scratch›
    ◦ copy all the text files (but only the text files) from ‹~/pb152/01›
    ◦ print first two lines of each of them
    ◦ list the directory content again
    ◦ remove all the exercise description files, that is ‹{number}.txt›
    ◦ list the directory once more
    ◦ remove all the remaining files
    ◦ remove the now-empty directory

 3. It may be helpful to know that you can type a ‹for› loop on a single line
    and use it as a command. Like this:
    
        $ for f in *.sh; do ls $f; done

 4. Another useful tidbit: ‹?› (question mark) matches a single character when
    globbing.

That was all for the exercise. The next thing to learn will be text editors,
because we will want to write some simple scripts. Go on to:

    $ cat editors.txt

¹ Sadly not this semester, due to COVID-related restrictions.
  Instead, you can ask questions in the discussion forum in IS or in
  the online chat.
