@sun @goo GNU has multiple kernels and multiple OS's.

Hurd is not an infant, although more features would be convenient.

There's the church of Emacs OS, the GNU GRUB OS, GNU Hurd, GNU Linux-libre and a number of other kernels that I don't remember the GNU package name of at the moment.

An operating system is a system of software that allows you to operate a computer and GNU indeed provides that; https://www.gnu.org/software/

Meanwhile if you tried to install just Linux, it'll just admit that it is not an OS and shut down; https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/init/main.c#n1513