Part I (Permissions and links)

Write terminal commands to do the following:

1. Create a file called restricted.txt.
2. Change the permissions on the restricted.txt file to allow the owner to read and write to the restricted.txt file. Do this using the Octal Notation.
3. Change the permissions on the restricted.txt file to only allow the owner, group and everyone to read and write and execute the restricted.txt file. Do this using the Symbolic notation.
4. Create a folder called secret_files. Inside the secret_files folder create a file called first_secret.txt and another folder called classified. Inside of the classified folder create a file called super_secret.txt.
5. Change the permissions on the secret_files to only allow the owner and group to read, write and execute in all the files and folders inside of secret_files. Do this using the Octal Notation.
6. Create a hard link for the restricted.txt called hard_link.
7. Create a symbolic link for the classified folder called classified_link.

Part II (Piping and Redirection)

For the following exercises, create a text file called vegetables.txt with the following text:

Lettuce
Amaranth
Beet
Celery
Kale
Dill
Cabbage
Broccoli
Lettuce
Amaranth
Beet
Spinach
Chard
Broccoli
Cabbage
Dill

Write the following terminal commands to do the following

1. Sort vegetables.txt.
2. Count the number of lines in vegetables.txt.
3. Create a file called vegetables_sorted.txt which contains all the unique vegetables sorted in ascending order in vegetables.txt (do this without the touch command).
4. Create a file called last_three.txt which contains the last three vegetables in the vegetables.txt file (do this without the touch command).
5. Count the number of lines the word "Broccoli" appears on (using wc and grep).

You can find the solutions here