Concept Map: redirecting stdout

I had problems in picking an aspect of shell programming to illustrate, and then carving out a nice boundary so that I explained something interesting that was smaller than the whole of the course. I was also wondering… Where are concept maps most usefully used? On problematic parts of a body of knowledge, presumably. What are they? (I don’t know).

<figcaption class="wp-caption-text">A concept map for stdout and redirecting it.</figcaption></figure> Question the first

I have a file containing weather station names called stations; I wish to sort the file and place the result in a file called sorted-stations. Which of the following commands does that?

1. sort > sorted-stations stations

   • stations

     sort

     sorted-stations

     • sort stations > sorted-stations

       • cat < stations | > sorted-stations sort </ol> Question the second

         Which of the following commands lists files to the screen (and may or may not have some other effect).

         1. ls > screen

            • cat kittens

              ls

              • ls

                • ls	sort < kittens </ol>