Opening and using the terminal in Linux CLI - Step-by-Step Execution

Concept Flow - Opening and using the terminal

User wants to run commands

↓

Open Terminal Application

↓

Terminal window appears

↓

User types command

↓

Terminal processes command

↓

Output shown in terminal

↓

User types next command or closes terminal

This flow shows how a user opens the terminal, types commands, and sees the output step-by-step.

Execution Sample

Linux CLI

echo Hello, Terminal!
ls
pwd

This sample shows typing three commands: print text, list files, and show current folder.

Execution Table

Step	User Action	Terminal Response	Output
1	Open terminal app	Terminal window opens
2	Type: echo Hello, Terminal!	Process echo command	Hello, Terminal!
3	Type: ls	List files in current directory	file1.txt file2.txt script.sh
4	Type: pwd	Show current directory path	/home/user
5	Close terminal	Terminal window closes

💡 User closes terminal or stops typing commands

Variable Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	Final
Terminal Window	Closed	Open	Open	Open	Closed
Last Command	None	echo Hello, Terminal!	ls	pwd	None
Last Output	None	Hello, Terminal!	file1.txt file2.txt script.sh	/home/user	None

Key Moments - 3 Insights

Why do I see a prompt waiting after opening the terminal?

The prompt means the terminal is ready to accept your commands, as shown in step 1 and 2 of the execution_table.

What happens if I type a command that the terminal does not recognize?

The terminal will show an error message instead of output, similar to step 3 but with an error instead of file list.

Why does the terminal show output after I type a command?

The terminal runs the command and prints the result, as seen in steps 2, 3, and 4 in the execution_table.

Visual Quiz - 3 Questions

Look at the execution table, what is the output after typing 'echo Hello, Terminal!'?

A file1.txt file2.txt script.sh

B Hello, Terminal!

C /home/user

D Terminal window opens

💡 Hint

Check the Output column at Step 2 in the execution_table.

At which step does the terminal show the current directory path?

A Step 4

B Step 3

C Step 2

D Step 5

💡 Hint

Look at the User Action and Output columns in the execution_table.

If the user closes the terminal at Step 5, what is the state of the Terminal Window in variable_tracker?

A Processing command

B Open

C Closed

D Waiting for input

💡 Hint

Check the Terminal Window row in variable_tracker at the Final column.

Concept Snapshot

Opening and using the terminal:
- Open terminal app to get a command prompt
- Type commands and press Enter
- Terminal runs commands and shows output
- Repeat typing commands or close terminal to exit
- Terminal shows errors if command unknown

Full Transcript

This lesson shows how to open and use the terminal on a Linux system. First, the user opens the terminal application, which displays a window with a prompt. The user types commands like 'echo Hello, Terminal!', 'ls', and 'pwd'. Each command runs when Enter is pressed, and the terminal shows the output below the command. The user can continue typing commands or close the terminal window to finish. The execution table traces each step, showing user actions and terminal responses. The variable tracker shows the terminal window state, last command, and output changing over time. Key moments clarify why the prompt appears, what happens with unknown commands, and why output shows after commands. The quiz tests understanding of outputs and terminal states at different steps. This visual trace helps beginners see exactly how the terminal works step-by-step.