Linux Basics

Welcome to Linux Basics! You're expected to answer a series of questions to get the flag. To view the questions, and answer them, you'll use the answer tool.

This was the given start screen and we have to answer a whole bunch of questions, so we will do them in order.

Answer 0

For question 1, it was about generating random permutations, after googling it, I saw it was shuf and I tried it.

Answer 1

For question 2, it asks for the modification date of myfile.txt, so I used ls -la to see the last modification date

Answer 2

For question 3 we can use the same command, we can see that the file size is 22200 bytes which is 22kb to the nearest whole number

Answer 3

For question 4 as well, we can use the same command to see that the user that owns the file is root

Answer 4

For question 5, we can use the permissions given to convert them to octal. The permssions were

-rwxr-xr-- which converted to octal is done as below

Owner permissions (rwx):

Read (r): 4 Write (w): 2 Execute (x): 1 Total for owner: 4 + 2 + 1 = 7 Group permissions (r-x):

Read (r): 4 No write (-): 0 Execute (x): 1 Total for group: 4 + 0 + 1 = 5 Other permissions (r--):

Read (r): 4 No write (-): 0 No execute (-): 0 Total for others: 4 + 0 + 0 = 4

Thus giving us, 754

Answer 5

For question 6, we need to find the user id of 'admin', which we can solve with the command cat /etc/passwd to find the user id of admin to be 1338

Answer 6

I will go through questions 7,8 and 9 all at once as they are mostly quite easy. For Question 7, john cannot write to /home/user/myfile.txt, answer 8 is yes as the admin user can execute the file and for answer 9, we refer back to our cat /etc/passwd and see that rose is the only other user that is in the admin group, thus it is rose.

Answer 7,8 and 9

For answer 10, we have to find what kind of file is myfile.txt. By using the file command, we can see that it is a jpeg file.

Answer 10

With this, we can get the flag. The flag is flag{8873fe66f8e7a6019d7d71261864f6c5}