What means inv ?ΒΆ

The inv command has been installed into your Python environment by the invoke package, which itself has been required by the atelier package.

The inv command is a kind of make tool which works by looking for a file named tasks.py. Every repository of the Lino framework contains such a file, and they all import a whole series of subcommands ("tasks") like inv prep or inv test. These tasks are defined in atelier.invlib and documented in the docs of the atelier package: inv tasks defined by atelier.