Opening and using the terminal in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of the command pwd?

You open a terminal and run the command pwd. What does it show?

Linux CLI

pwd

A /home/username

B List of files in the current directory

C Shows the current date and time

D An error message saying command not found

💡 Hint

Think about what 'pwd' stands for and what it tells you.

The pwd command prints the current working directory path. It shows where you are in the file system.

💻 Command Output

intermediate

What happens when you run ls -l in the terminal?

You type ls -l and press Enter. What output do you expect?

Linux CLI

ls -l

A An error saying invalid option

B Only the names of files and directories without details

C The current directory path

D A detailed list of files and directories with permissions, owner, size, and date

💡 Hint

The -l option means 'long format'.

The ls -l command lists files with detailed info like permissions, owner, size, and modification date.

📝 Syntax

advanced

Which command correctly changes directory to the parent folder?

You want to move one folder up from your current location. Which command is correct?

A cd /

B cd ..

C cd .

D cd ../..

💡 Hint

The parent folder is one level above the current folder.

The command cd .. moves you up one directory level (to the parent folder).

💻 Command Output

advanced

What error appears if you try to run cd nonexistent_folder?

You type cd nonexistent_folder where the folder does not exist. What is the output?

Linux CLI

cd nonexistent_folder

A bash: cd: nonexistent_folder: No such file or directory

B Moved to nonexistent_folder

C Permission denied

D Command not found

💡 Hint

Think about what happens when you try to enter a folder that does not exist.

The shell shows an error saying the folder does not exist when you try to change to it.

🚀 Application

expert

How many files and directories are listed by ls -a in a folder with 3 visible files and 2 hidden files?

You have 3 normal files and 2 hidden files (names start with a dot) in a folder. What is the total number of items shown by ls -a?

Linux CLI

ls -a

A 5

B 6

C 7

D 3

💡 Hint

Remember that ls -a also shows '.' and '..' entries.

The ls -a command shows all files including hidden ones and the special entries '.' (current directory) and '..' (parent directory). So total is 3 visible + 2 hidden + 2 special = 7.

Practice

1. What is the main purpose of opening a terminal on a Linux system?

easy

A. To type commands to control the computer

B. To watch videos

C. To browse the internet

D. To play music

Solution

1. Step 1: Understand what a terminal does

   The terminal allows users to type commands to control and manage the computer.

2. Step 2: Compare options with terminal use

   Watching videos, browsing internet, and playing music are done with other apps, not the terminal.

3. Final Answer:

   To type commands to control the computer -> Option A

4. Quick Check:

   Terminal = command control [OK]

Hint: Terminal is for commands, not media [OK]

Common Mistakes:

• Thinking terminal is for media
• Confusing terminal with GUI apps
• Not knowing terminal controls computer

2. Which of the following commands correctly opens a new terminal window in most Linux desktop environments?

easy

A. gnome-terminal

B. open-terminal

C. start-terminal

D. launch-term

Solution

1. Step 1: Identify common terminal commands

   The command gnome-terminal is the standard way to open a terminal window in GNOME desktop.

2. Step 2: Check other options

   Commands like open-terminal, start-terminal, and launch-term are not standard Linux commands.

3. Final Answer:

   gnome-terminal -> Option A

4. Quick Check:

   Standard terminal command = gnome-terminal [OK]

Hint: Remember GNOME uses gnome-terminal command [OK]

Common Mistakes:

• Typing non-existent commands
• Confusing Windows commands with Linux
• Using wrong command names

3. What will be the output of the command pwd immediately after opening a new terminal?

medium

A. /usr/bin

B. /root

C. /etc

D. /home/username

Solution

1. Step 1: Understand what pwd does

   The pwd command shows the current directory path.

2. Step 2: Know the default directory on terminal open

   When a user opens a terminal, it usually starts in their home directory, like /home/username.

3. Final Answer:

   /home/username -> Option D

4. Quick Check:

   New terminal starts in home directory [OK]

Hint: New terminal starts in your home folder [OK]

Common Mistakes:

• Assuming root or system folders
• Not knowing pwd shows current folder
• Confusing with other commands

4. You typed ls -l but got an error: ls: command not found. What is the most likely cause?

medium

A. You are not in the home directory

B. You need to use list -l instead

C. The ls command is not installed or PATH is broken

D. You forgot to open the terminal

Solution

1. Step 1: Understand the error message

   The error command not found means the system cannot find the ls command.

2. Step 2: Identify common causes

   This usually happens if the command is missing or the PATH environment variable is broken.

3. Final Answer:

   The ls command is not installed or PATH is broken -> Option C

4. Quick Check:

   Command not found = missing command or PATH issue [OK]

Hint: Command not found means missing or PATH error [OK]

Common Mistakes:

• Thinking directory location matters
• Using wrong command names
• Ignoring terminal must be open

5. You want to open a terminal and immediately list all files in your Documents folder. Which command should you use?

hard

A. open-terminal ls Documents

B. gnome-terminal -- bash -c "ls ~/Documents"

C. start-terminal -list ~/Documents

D. terminal ls -all Documents

Solution

1. Step 1: Understand how to open terminal and run a command

   The command gnome-terminal -- bash -c "ls ~/Documents" opens a terminal and runs ls ~/Documents.

2. Step 2: Check other options for correctness

   Other options use invalid commands like open-terminal, start-terminal, or wrong syntax.

3. Final Answer:

   gnome-terminal -- bash -c "ls ~/Documents" -> Option B

4. Quick Check:

   Open terminal and run command = gnome-terminal -- bash -c [OK]

Hint: Use gnome-terminal with bash -c to run commands [OK]

Common Mistakes:

• Using non-existent commands
• Wrong syntax for running commands
• Not quoting commands properly