> For the complete documentation index, see [llms.txt](https://ravins-organization.gitbook.io/ctf-writeups/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ravins-organization.gitbook.io/ctf-writeups/2024/huntress-ctf-2024/miscellaneous/linux-basics.md). # 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.

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

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

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

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

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

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`

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.

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.

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