shell-genomics/02-the-filesystem - hidden directory exercise

[duanyuncheng]

In the exercise Finding hidden directories, ls -a will output . .. .hidden sra_metadata untrimmed_fastq to the terminal. I think that leaving the . and .. there without explanations might make the learners confused (what are those two directories start with a dot?). Since cd ../ was introduced before this exercise, this exercise might be a good place to add the introduction to .. and/or ., which will only take one sentence or two. Or maybe introduce this exercise before introducing cd ../ so that the learners have some sense of what .. represents before they are taught to use cd ../ to navigate to the parent directory.

[martinosorb]

+1
I actually taught this today and I had to stop and explain.