## Exercise 1

Let's refresh our memory of shell scripts and pipes. Write a script, that:

 1. uses ~/pb152/01/oslist.csv as the input,
 2. prints the number of operating systems by Microsoft,
 3. prints the year and name of all operating systems by Apple,
 4. prints the list of all mono- and microkernel operating systems.

That should have been fairly easy. Let's move on to ‹02.txt›.
