Working with the File System and Permissions

Question 1

Which command is used to print any human-readable strings from a file to the terminal?

Answer 1

strings {file}

Question 2

How to create a copy of a file?

Answer 2

cp {file} {nameOfTheFileCopy}

Question 3

How to determine what file type is a certain file?

Answer 3

file {file}

Question 4

How to sort a file alphabetically and remove duplicate adjacent lines?

Answer 4

sort -u

Question 5

How to sort a file alphabetically in a reverse order?

Answer 5

sort -r

Question 6

How to sort a file alphabetically?

Answer 6

sort

Question 7

How to push the entire file to the screen and reverse the order of items in the file?

Answer 7

tac

Question 8

How to push the entire file to the screen?

Answer 8

cat

Question 9

How to display information about files/directories in a directory?

Answer 9

ls -l

Question 10

How to display content of a directory including hidden files?

Answer 10

ls -a

Question 11

How to delete a non-empty directory?

Answer 11

rm -r {dirName}

Question 12

How to delete an empty directory?

Answer 12

rmdir

Question 13

How to create a directory?

Answer 13

mkdir {directory}

Question 14

Which command is used to view permissions in the terminal?

Answer 14

ls -l

Question 15

Expalain -rwxrw-r--

Answer 15

• - indicates the type of file (e.g., - for a regular file, d for a directory)
• rwx show the permissions for the user
• rw- show the permissions for the group
• r-- show the permissions for others

Question 16

Which command is used to change file permissions?

Answer 16

chmod

Question 17

What are the 2 different ways of chaning permissions?

Answer 17

• Symbolic Mode
  
  • modify permissions using symbols to represent the user category and the action you want to take
• Numeric (Octal) Mode
  
  • each permission type is assigned a number: read (4), write (2), and execute (1)
  • numbers are summed up for each user category (user, group, others)

Question 18

In Symbolic Mode, what character is used to add a permission?

Answer 18

+

Question 19

In Symbolic Mode, what character is used to remove a permission?

Answer 19

-

Question 20

In Symbolic Mode, what character is used to set exact permissions and override existing ones?

Answer 20

=