Interpret the meaning of the following VI editor commands i) ESC ii) u c) Identify the TWO main types of shells and their prompts in Linux environment Virtual terminals are Command Line Interfaces which execute the user commands. (4 mark Demonstrate the usage of the following shortcuts while working on virtual terminal (5 mar i) Ctrl+Alt+Del ii) Tab iii) Ctrl+u iv) Ctrl+w v) Ctrl+k (5 marks)

i) ESC: The ESC key is used in the VI editor to cancel the current command or to exit the command mode. It is a common key used to interrupt or stop the current operation.<br /><br />ii) u: In the VI editor, the 'u' command is used to undo the last change made. It allows the user to revert the last modification or command.<br /><br />The two main types of shells and their prompts in a Linux environment are:<br /><br />1. Bash (Bourne Again SHell): Bash is a popular shell in Linux. Its prompt typically looks like this: [username@hostname]$.<br /><br />2. Zsh (Z Shell): Zsh is another commonly used shell in Linux. Its prompt usually appears as follows: [username@hostname]%.<br /><br />Virtual terminals are Command Line Interfaces (CLI) which execute user commands. They provide a text-based interface for users to interact with the operating system.<br /><br />Demonstration of the usage of the following shortcuts while working on a virtual terminal:<br /><br />i) $Ctrl+Alt+Del$: This shortcut is used to open the task manager or the system monitor in many Linux distributions. It allows users to view and manage running processes.<br /><br />ii) Tab: The Tab key is used for auto-completion in the terminal. It helps to save time by automatically suggesting and completing commands or file names.<br /><br />iii) $Ctrl+u$: This shortcut is used to delete the current line of text in the terminal. It is useful for correcting mistakes or removing unwanted commands.<br /><br />iv) $Ctrl+w$: The $Ctrl+w$ shortcut is used to delete the word before the cursor in the terminal. It helps to remove words quickly without using the arrow keys.<br /><br />v) $Ctrl+k$: The $Ctrl+k$ shortcut is used to delete text from the cursor's position to the end of the line in the terminal. It is useful for removing unwanted text or commands.