1. I have a file with the following permissions: -rw-r--r-- 1 jessica jessica ..

Question

1. I have a file with the following permissions:

-rw-r--r-- 1 jessica jessica ....... topsecret.jpg

I want to change the permissions so that the file can be read and written to by the file's owner and group ONLY.
What command would make that change? USE OCTAL NOTATION ONLY.

2. Use UGOA notation to change the following file's permission from this:

-rw-r----- 1 jessica jessica ....... topsecret.jpg

to this:

-rwxr-xrw- 1 jessica jessica ....... topsecret.jpg

USE UGAO NOTATION ONLY - NOT OCTAL

3. User jjones has quit to pursue knitting and I need to not only remove heraccount from my server, but backup the user's home directory
AND then delete all files which were owned by the user. What SINGLE command would do this?

4. Whoops! I just ran the following command:

# sudo chmod 000 ./mydirectory

Now I can't read the directory or cd into it! Show me a command that would allow the directory's owner and group to cd to the directory and list the contents
for the owner and group of the directory ONLY!

5. I run a server that currently has 80 users logged in. I am interested in finding out if user 'captainamerica' has logged in, and if so, when he logged in.  
What command sequence would I use to show me the status for 'captainamerica' ONLY -- no one else (Hint: one of the commands is grep)

6. I created a file last week SOMEWHERE on my hard drive and I know the file name contains either the word "pizza" or "PIZZA" or "piZZa" or "PIZza".
What command would I run to find that file?

7. I have two files, one called smaller.txt and another called ontheoutside.txt. I want to concatenate them into a single file called tetris.txt.  
What command would I use?

8. What is /dev/sdb4? (I want a detailed explanation of EACH component)

9. I want to manually mount a thumb drive (/dev/sdb1) that has an NTFS (Windows) file system. I created a directory called 'evidence' on which to mount it.  
Specify the command to manually mount the thumb drive on the directory '~/evidence'. Note: I don't want to see 'auto' in the answer.

10. I'm finished with the thumb drive from Question 9 above. Specify the command to unmount the drive.

Explanation / Answer

1) Command to change the permissions so that file can be read and written by file's owner and group ony using octal notation :

chmod 664 topsecret.jpg

2) To change the file permission as specified in the ques we will use the below command :

chmod u=rwx, g=rx, o=rw topsecret.jpg

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