3. Introduction To Linux Commands

Question 1

What command lists the files and sub-directories in a given directory(displays the contents of a directory)?

Answer 1

The “ls” command

Question 2

How would you list the files and directories in a directory you are not currently in?

Answer 2

ls “directory path”

The path can either be an absolute path or a relative path

Question 3

How would you list the contents of a directory, including the hiding files and sub-directories?

Answer 3

ls -a

Question 4

Which command is used to create a new user in Linux?

Answer 4

sudo adduser username

Question 5

In Linux which command is used to display the name of the current user?

Answer 5

whoami

Question 6

What is the sudo command?

Answer 6

It is a command used to give the current user temporary admin privileges.

Question 6

What type of user is created with the “sudo adduser username” command?

Answer 6

A regular user with no admin privillages.

Question 7

Which command will you use to create a user with admin privileges?

Answer 7

sudo -u root adduser username

Question 8

What command is used to clear the screen of your terminal?

Answer 8

clear

Question 9

What command is used from one directory to another?

Answer 9

cd path

NB: The path can be relative or absolute

Question 10

What command is used to move to the previous directory you were in?

Answer 10

cd -

Question 11

Where are the command files found in Linux?

Answer 11

The bin and sbin directories.
The bin directory contains regular commands, while the sbin directory contains commands meant to be executed by admins(the types of commands you will need to add sudo to, to make it work)

Question 12

What command is used to change the current user’s password?

Answer 12

passwd

Question 13

What is the purpose of the cat command?

Answer 13

Concatinitinating the content of files and displaying said contents on the terminal.

Question 14

Using the cat command how will you display the contents of a file?

Answer 14

cat filename.extension

Question 15

using the cat command how will you join/concatenate the contents of multiple files and write them in a new file?

Answer 15

cat filename.ext filename.ext > newfilename.ext
It also replaces the content in the new file if there is already content.

Question 16

using the cat command how will you append the contents of one file in another file?

Answer 16

cat file1name.ext&raquo_space; file2name.ext

Question 17

Using the cat command how will you display how many lines exist in a certain file?

Answer 17

cat -n filename.txt