If the current state of LWOS is:

• Interrupts
  • Keyboard: true
• Pressed Key: k

And k is not the Enter key, then LWOS performs the following actions:

• Append "k" to Shell -> User Input.
• Append "k" to Shell -> Buffer.
• Reset Interrupts -> Keyboard to false.

For example, when a user presses the "p" key, the keyboard interrupts LWOS as follows:

• Hostname: "computer_1"
• Status: "idle"
• Interrupts
  • Keyboard: true
• Pressed Key: "p"
• Shell
  • User Input: ""
  • Buffer: "> "

In response, LWOS updates Interrupts -> Keyboard and the Shell as follows:

• Hostname: "computer_1"
• Status: "idle"
• Interrupts
  • Keyboard: false
• Pressed Key: "p"
• Shell
  • User Input: "p"
  • Buffer: "> p"

Interrupts -> Keyboard then stays false until the user presses a key again.

Suppose that the user then enters "w" and "d." Then the LWOS state becomes:

• Hostname: "computer_1"
• Status: "idle"
• Interrupts
  • Keyboard: false
• Pressed_key: "d"
• Shell
  • User Input: "pwd"
  • Buffer: "> pwd"

Next, the user presses the Enter key. This prompts LWOS to perform the following actions:

• Append a new line character (\n) to Shell -> Buffer.
• Execute the command that is stored in Shell -> User input (pwd).
• If the command produces any output, append it to Shell -> Buffer.
• Reset Shell -> User Input to an empty string ("").
• Reset Interrupts -> Keyboard to false.

Here is the final LWOS state:

• Hostname: "computer_1"
• Status: "idle"
• Interrupts
  • Keyboard: false
• Pressed_key: "Enter"
• Shell
  • User Input: ""
  • Buffer: "> pwd
    /
    > "

The output of the "pwd" command is the working directory, which is currently the root folder (/). LWOS prints the working directory and then prints the prompt so that the user can enter more commands.

Try running the "pwd" command in the shell below:

> ▮