QUESTION 1 You have finished your thesis, and want to set the permissions so tha
ID: 3809611 • Letter: Q
Question
QUESTION 1
You have finished your thesis, and want to set the permissions so that it is hard to accidentally delete or overwrite the file.
Normally, if you were to type "rm Thesis.txt", it would just delete it without asking. Or, if you moved a file with the same name into the same directory as your original Thesis.txt, it would overwrite it with the new version.
Which command would change the permissions for a file called Thesis.txt so that you are less likely to delete or overwrite it by accident?
chmod o-rwx Thesis.txt
chmod a+rwx Thesis.txt
chmod a+w Thesis.txt
chmod a-w Thesis.txt
QUESTION 2
You have a file named Homework with the following permissions:
-rw-r--r-- 1 fsmith staff 12 Feb 20 14:08 Homework
Which command would you type to make sure that you were the only one with permission to view the contents of the file? (permissions should look like this when done)
-rw------- 1 fsmith staff 12 Feb 20 14:08 Homework
chmod 400 Homework
chmod 600 Homework
chmod rw Homework
chmod 777 Homework
QUESTION 3
Match the name of the directory to the description
/etc
/usr/bin
/
/var
The directory that holds most of the computer programs or applications
The directory that holds most of the system configuration files
The root, or top of the Unix directory tree. All directories are sub-directories of this.
This directory holds data that is often changing, like database files, incoming user email, etc.
QUESTION 4
A file named "homework" had the following permissions: -rw-r--r--
Which command could have been typed to change the permissions to this: -r--r-----
chmod a-r homework
chomd g-r homework
chmod 440 homework
chmod 465 homework
QUESTION 5
Which command would you type to delete a file named "Bad-Homework.txt"?
dl Bad-Homework.txt
rm Bad-Homework.txt
rm bad-homework.txt
ln bad-homework.txt
QUESTION 6
In Unix, what does the .. (or dot dot) directory specify?
The last directory visited
The current working directory
The working directory's parent directory
The top of the directory tree
QUESTION 7
If you have been wandering around the Unix filesystem, which command could you type to bring you back to your home directory?
ls
pwd
cd
home
QUESTION 8
What key or keys can you press to interrupt (politely ask to terminate) a program that is running in your terminal?
Delete-Enter
Ctrl-c
ESC
X
QUESTION 9
There might be more than one version of a program on a Unix system, and you might not know which one is executed when you type the name of the command. What would you type to identify the exact location of a program named "lsof"?
id lsof
which lsof
where lsof
uniq lsof
QUESTION 10
What is the difference between > and | ? Or what is the difference between redirection and the pipe?
They are both the same, but pipelines were added by Linux as an alternative symbol.
The redirection operator connects a command with a file while the pipeline operator connects the output of one command with the input of a second command.
The redirection operator connects a command can be used by regular users on a system, while pipelines can only be used by administrators.
The redirection operator connects a command with a file while the pipeline operator reads input from the keyboard.
a.chmod o-rwx Thesis.txt
b.chmod a+rwx Thesis.txt
c.chmod a+w Thesis.txt
d.chmod a-w Thesis.txt
Explanation / Answer
QUESTION 5
Which command would you type to delete a file named "Bad-Homework.txt"?
answer is dl Bad-Homework.txt
QUESTION 6
In Unix, what does the .. (or dot dot) directory specify?
answer is The current working directory
QUESTION 7
If you have been wandering around the Unix filesystem, which command could you type to bring you back to your home directory?
answer is ls
QUESTION 8
What key or keys can you press to interrupt (politely ask to terminate) a program that is running in your terminal?
answer is X
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