Interactive Shell (IEx)

Introduction[edit]

The Interactive Shell or IEx is an essential tool for Elixir programmers. It provides a command-line interface to interact with the Elixir runtime system. IEx allows developers to write, execute, and test code in an interactive manner, making it easier to explore and understand the language and its capabilities. This article explores the various features and functionalities of IEx.

Starting IEx[edit]

To start IEx, open a terminal and enter the command: Template:Code

Basic Usage[edit]

Once inside the IEx shell, you can execute Elixir code directly in the prompt. Here are some basic commands:

Evaluate an expression: Template:Code
Define a variable: Template:Code
Print the value of a variable: Template:Code
Load and execute a file: Template:Code
Exit IEx: Template:Code

Shell Features[edit]

Help[edit]

IEx provides a built-in help system to assist with usage and understanding of Elixir features. To access help, use the following command:

Template:Code

Tab Completion[edit]

IEx supports tab completion, allowing you to quickly navigate and explore available modules, functions, and variables. Pressing the tab key will display available completions.

Shell Commands[edit]

IEx provides various shell commands to enhance productivity and control the environment:

Template:Code: List all available functions and modules.
Template:Code: Display the current process ID.
Template:Code: List all running processes.
Template:Code: Flush the message inbox of the current process.
Template:Code: Recompile Elixir code.
Template:Code: Clear the shell screen.

History[edit]

IEx keeps a history of executed commands. You can access previous commands by pressing the up and down arrow keys or by using the h command.

Configuration[edit]

IEx allows customization through its configuration file. You can modify the behavior, colors, and even add custom commands. The configuration file is located at: ~/.iex.exs.

Breakpoints[edit]

IEx supports breakpoints to assist with debugging. By using the require command, you can access the IEx.pry function and set breakpoints within your code.