=== modprobe

If you are feeling fancy, you can also insert modules with:

....
modprobe dep2
lsmod
# dep and dep2
....

This method also deals with module dependencies, which we almost don't use to make examples simpler:

* https://askubuntu.com/questions/20070/whats-the-difference-between-insmod-and-modprobe
* https://stackoverflow.com/questions/22891705/whats-the-difference-between-insmod-and-modprobe

Removal also removes required modules that have zero usage count:

....
modprobe -r dep2
lsmod
# Nothing.
....

but it can't know if you actually insmodded them separately or not:

....
modprobe dep
modprobe dep2
modprobe -r dep2
# Nothing.
....

so it is a bit risky.

`modprobe` searches for modules under:

....
ls /lib/modules/*/extra/
....

Kernel modules built from the Linux mainline tree with `CONFIG_SOME_MOD=m`, are automatically available with `modprobe`, e.g.:

....
modprobe dummy-irq
....
