And some more commands related to packages:
This command just displays a message (in the minibuffer) with the
number of available packages. Along with the default Guix packages,
this number includes the packages from
environment variable (see Package Modules in The GNU Guix
Show a package graph. You’ll be prompted for a package name, graph backend and graph node type (everything can be completed with TAB key). See Graph Configuration, if you want to set an external graph viewer.
Show a package size (see Invoking guix size in The GNU Guix Reference Manual). You’ll be prompted for a package name and a size type (it should be either “text” or “image”).