Vi

Vi is a powerful text editor used mainly on Unix-like systems, known for its speed and efficiency. It operates through modes: a mode for entering text and another for issuing commands to manipulate that text, allowing for rapid editing and navigation. Vi is highly configurable, supports automation through scripting, and is often used for editing files directly on servers or systems without graphical interfaces. Its design emphasizes minimal resource use and speed, making it a favorite among experienced programmers and system administrators. Despite its learning curve, mastery of Vi greatly enhances productivity in editing and managing text files.