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I've also had a few questions on this. The font could certainly make the distinction clearer. For programming, this is a useful font-selection criteria, along with slashed zeros to distinguish 0 and O. The font is probably something for the styles repository though?
I can confirm that this can be confusing - it has been an issue in our courses as well. However: as far as I understand, you are not supposed to show the direct rendered output of Carpentry classes anyway: you are supposed to show your own terminal where you type those commands and ideally talk while doing it.
With this in mind, I suggest instead to maybe add a sentence in the right places to the instructions, reminding instructors to mention specifically that this is a letter or number depending on the place.
In addition: do we have a case when a terminal by default chooses a font that makes this difficult?
These lessons can (and are) used in a variety of ways. Some instructors don't show the notes: some always do. So given that some instructors do show this image, it would be good to make the font less ambiguous.
wc is the ‘word count’ command: it counts the number of lines, words, and characters in files (returning the values in that order from left to right). Reminder: Shell commands like wc often allow using options to change their outputs. In this example, the -l option is used. wc -l is actually shortened version of wc --line.