[intro_to_linux]$ ls -R
[intro_to_linux]$ ls -R | grep "Feb"
February
./data/2022/February:
Feb
./data/2023/Feb:

# Ignore case.
[intro_to_linux]$ ls -R | grep -i "Feb"
feb
./data/2021/feb:
february_01_2021.tx
February
./data/2022/February:
Feb
./data/2023/Feb:

Questions:

1. How does the wc command work? What are its options?

2. How does the sort command work? What are its options?

3. How does the uniq command work? What are its options?

4. How many unique varieties of beans are there in the vegetables.txt file?