lab_pipes/exercises.md

Exercises

Answer the following questions (or at least as many as you can figure out) in this document. For all the questions, use the 100k words. Give your answer for each exercise, and show the command you used to get it. Each question can be answered using a single Terminal command, though you might need to use a number of pipes.

If you want to be really stylish, put your code inside of backticks like this:

cat words_100k.txt | length | put 10 | equal | count

1. What is the longest word?

The longest word is "antidisestablishmentarianism." I use the following command: cat words_100k.txt | length | order -r | head -n 1 | pluck 1

2. How many words have two u's in a row?

There are 16 words that have two u's in a row. I used the following command: cat words_100k.txt | match "uu" | count

3. How many words have the word "cat" in them?

There are 893 words with the word "cat" in them. I used the following command: cat words_100k.txt | match "cat" | count

4. How many words have all five vowels (aeiou)?

There are 812 words that have all five vowels. I used the following command: cat words_100k.txt | match "a" | match "e" | match "i" | match "o" | match "u" | count

5. Which words have two l's in a row, two m's in a row, and two t's in a row? (they don't have to be in that order)

There are no words that have two l's in a row, two m's in a row, and two t's in a row. I used the following command: cat words_100k.txt | match "ll" | match "mm" | match "tt" | count

6. How many words have sixteen or more letters?

There are 696 words that have sixteen or more letters. I used the following command: cat words_100k.txt | length | order -r | put 16 | lessthan 0 1 -e | count

7. What's the most frequent 10-letter word?

The most frequent 10-letter word is "government." I used the following command: cat words_100k.txt | frequency | length 1 | put 10 | equal 0 1 | order 2 -r | head -n 1 | pluck 3

8. What's the longest word which doesn't have any repeated letters?

The longest word that doesn't have any repeated letters is "salpingectomy," which has 13 letters. I used the following command: cat words_100k.txt | length | unique 1 | length | equal 0 2 | order -r | head -n 1 | pluck 3

Edit: I found that there are four words with the same number of letters as "salpingectomy:" "troublemaking" "unproblematic" "copyrightable" "unpredictable" I found these by manually counting the number of letters in salpingectomy and then using the following command: cat words_100k.txt | length | unique 1 | length | equal 0 2 | order -r | head -n 10 | put 13 | equal | pluck 4 I'm not sure if I hadn't thought to check how I would've known there were ties using the commands I had available to me.

9. What's the longest word which only uses four different letters?

The longest word that uses only four different letters is "senselessness." I used the following command: cat words_100k.txt | unique | length | put 4 | equal | length 3 | order -r | head -n 1 | pluck 4

10. If you rearrange the letters in "sidebar," what other words can you create?

The other words that I can create by rearranging the letters in "sidebar" are: "braised" and "seabird." I used the following command: cat words_100k.txt | length | unique 1 | length | equal 0 2 | put 7 | equal | pluck 4 | match "s" | match "i" | match "d" | match "e" | match "b" | match "a" | match "r"