asdf

asdf is a CLI version manager for language runtimes. It replaces separate tools such as gvm, nvm, rbenv and pyenv with one command set. Support for each language is added by installing that language's plugin, and the plugin system is open, so anyone can write a plugin for another language. A plugin template and a list of existing plugins are linked from the README.

Versions are set per project in a single .tool-versions file, and a single global config holds the defaults. asdf switches runtime versions automatically as you move between directories. It can also read existing .node-version, .nvmrc and .ruby-version files, which eases migration from other version managers.

Shell completion is available for Bash, Zsh, Fish and Elvish. The tool is aimed at developers who work in several languages, or on several projects that need different runtime versions, and want one consistent set of commands. Full documentation, including the command reference and plugin authoring guide, is on asdf-vm.com. The project also provides GitHub Actions.