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e

Erlang version manager - A basic CLI tool for managing multiple Erlang versions.

Overview

e is a lightweight Erlang version manager that allows you to install and switch between different versions of Erlang/OTP on your system.

Building

Build the escript:

rebar3 escriptize

The executable will be created at _build/default/bin/e.

Installation

To make e available system-wide, copy the built executable to a directory in your PATH:

sudo cp _build/default/bin/e /usr/local/bin/

Or add the build directory to your PATH:

export PATH=$PATH:/path/to/e/_build/default/bin

Usage

List installed versions

e list

Shows all installed Erlang versions. The currently active version is marked with *.

Install a version

e install <version>

Example:

e install 26.2.1

Note: This basic implementation creates a placeholder installation. In a production version manager, this would download and compile Erlang from source.

Switch to a version

e use <version>

Example:

e use 26.2.1

Sets the specified version as the current active version.

Show current version

e current

Displays the currently active Erlang version.

Uninstall a version

e uninstall <version>

Example:

e uninstall 25.3

Removes an installed version. You cannot uninstall the currently active version.

Help

e help

Shows usage information and available commands.

Testing

Run the test suite:

rebar3 eunit

How it works

e stores installed Erlang versions in ~/.e/versions/ and tracks the current version in ~/.e/current.

Future Enhancements

  • Actual Erlang source download and compilation
  • Pre-built binary downloads
  • Shell integration for automatic PATH management
  • Version aliases (e.g., stable, latest)
  • List available versions from erlang.org
  • Parallel compilation support