fish shell

1. Introduction

   Overview of fish features such as autosuggestions and syntax highlighting.

2. Tutorial

   A guided tour of commands, variables, functions and configuration.

3. Language reference

   Syntax, quoting, command substitution, variables and control flow.

4. Interactive use

   Autosuggestions and key bindings.

5. Fish for bash users

   Syntax differences like set versus export and command substitution.

6. Completions

   Writing completions with the complete command.

7. Prompt

   Defining fish_prompt and fish_right_prompt.

8. set command

   Creating and scoping variables with set -l, -g, -x and -U.

9. function command

   Defining functions with arguments, descriptions and event handlers.

10. abbr command

    Abbreviations expanded as you type.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.