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After the exercise "Piping Commands Together", you introduced that "a filter is a program like wc or sort that transforms a stream of input into a stream of output". Perhaps moving this part to earlier sections of this episode will be more useful, maybe somewhere right after wc and sort were introduced?
For the "Pipe Construction" section, perhaps we can add a hint, e.g. "remember that uniq only filters out adjacent matching so similar animal names have to be adjacent to each other before you use the uniq command". This can remind the students to remember using the sort command.
For key points at the end of the episode, perhaps we can add the other commands that were covered in this episode, e.g. uniq, echo and cut? I think the key points section can help summarise what was learnt and these commands can be quite important too.
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I agree with Kai-lim this episode could do with some improvement. Introducing the episode, it would be great to explain what are pipes and filters since these words are not used till much later.
Where it says "wc is the ‘word count’ command: it counts the number of lines..." I think this should also say wc as example of a filter. Then the section "Why isn't it doing anything?" makes immediate sense in that the command is waiting for input, before it can produce output.
Then, where we introduce example of pipe ("The vertical bar, |, between the two commands is called a pipe."), it might be a good idea to say this extends "filter", where the output of the preceding command is the input of the following command.
I also think the episode should be renamed Filters and Pipes, to reflect the order.