What is considered the standard Unix editor?

The standard Unix editor is vi because it has been a fundamental text editor in Unix environments since its introduction in the 1970s. vi provides a powerful set of editing tools that allow users to manipulate text efficiently. Its design facilitates both simple and complex edits, making it suitable for novices and experienced programmers alike, which is why it has become a staple in Unix-based systems.

vi operates in different modes, namely 'command mode' and 'insert mode'. In command mode, users can perform various operations like saving files, navigating through text, and deleting lines, while insert mode allows for text entry. Its modal nature may initially seem complex, but it allows for rapid text manipulation once mastered.

Other choices do not represent text editors. File Transfer Protocol (FTP) is a network protocol used for transferring files, while 'Command' and 'Insert' do not refer to specific text editors in the context of Unix. Thus, vi stands out as the clear choice for the standard text editor in Unix systems.