Question and data repository for the 2023 Capture the Flag.

1 | Where is the curl executable located? Some systems vary, if your answer is incorrect, try a common alternative.

2 | What is the linux command used for reading manuals?

3 | Where is the less executable located?

4 | What is the key for scrolling down by one half of screen size in less?

5 | What is the longer name of the -K flag to curl?

6 | What is the cp command flag allowing for copying directories?

7 | What is the ls command flag used for human-readable output?

8 | What is the mv command flag which will interactively prompt before overwriting files?

9 | What is the cat command flag which shows line numbers?

10 | If the variable STRING is set to banana, what does the command echo ${STRING:4}$ return?

11 | If the variable STRING is set to to be or not to be, what does the command echo ${STRING[@]/be/eat} return?

12 | If the variable a is set to 3 and b is set to 4, what does the command if [[ $a -le $b ]]; then echo $a; else echo $b; fi return?

13 | If the variable p is set to (3 1 4 1 5 9), what does the command echo $((${p[0]} * ${p[2]})) return?

14 | What is the grep command flag used to select non-matching lines?

15 | What is the longer name of the -c flag to grep?

16 | How many lines are in file_a.txt?

17 | What does the command head -n 10 file_a.txt | wc -l return?

18 | How many words in file_a.txt start with the letter "d"?

19 | How many words are in file_a.txt that contain only 4 letters?

20 | What is the last word in file_b.txt?

21 | How many words contain "ello" inside them in file_b.txt?

22 | What is the line number of the word "helicopter" in file_b.txt?

23 | What is the line number of the word "croissant" in file_c.txt?

24 | How many characters are in file_c.txt?

25 | How many words contain "croissant" inside them in file_c.txt?

26 | How many words end with the letter "t" in file_c.txt?

27 | How many words start with the letter "c" in file_c.txt?

28 | How many words have the letter "o" directly followed by either "u" or another "o" in file_c.txt?

29 | What word is at the same line in file_c.txt as the word "sheep" is in file_a.txt?

30 | What is the second word in file_c.txt which contains the letter x?