Vim

Vim is a modal, open-source text editor derived from vi. It is fast, keyboard-driven, and designed to work well with Unix tooling.

Overview

Lightweight and efficient
Strong at composable text manipulation
Steep learning curve, high long-term payoff

Reference

Design philosophy

Edit text in Vim and delegate complex processing to external tools
Compose small commands instead of reimplementing Unix utilities

Modes

Mode	Purpose
Normal	Default mode for navigation and commands
Insert	Text entry
Visual	Select text
Command (`:`)	Run single-line commands
Replace	Overwrite existing text
Ex	Batch command mode

Mode semantics

Normal mode is the starting point and the main control plane
Insert mode is for text entry via i, a, or o
Visual mode supports character, line, and block selection
Command mode runs commands such as saving or search and replace
Replace mode overwrites existing characters
Ex mode is a lower-level batch interface exposed through :

:w
:q
:wq
:%s/foo/bar/g

Unix integration

:!grep pattern %

Learning resource

vimtutor

:Tutorial

Mental Model

Normal mode = control
Insert mode = data entry
Visual mode = selection
Command mode = batch operations
Efficiency comes from fewer mode switches and small composable commands