Unrelated to the main subject, but I wonder why in the shell example the user is asked to write all the numbers from 1 to 10 (via cat!), when `seq 1 10` is equa

Unrelated to the main subject, but I wonder why in the shell example the user is asked to write all the numbers from 1 to 10 (via cat!), when `seq 1 10` is equally expressive, and much more coincise.