Air rebuilds and restarts Go applications when project files change. It is a development tool, not a production deployment service. Requires google-go-lang (Go 1.26 or newer) to build Air and compile projects using its default build command. Run air as your normal user from your project directory. Use "air init" to create a project-local .air.toml, then edit it for your application. Use "air -c PATH" to select another configuration file. An example is installed in /usr/doc/air-/air_example.toml. Air executes the build and run commands in its configuration. Only use trusted projects and configuration files; do not run Air as root.