The easiest way to install QMK CLI and all the necessary
dependencies on FreeBSD is to use the packages
from the official FreeBSD Ports Collection.
This is possible since QMK CLI has been added to the Ports Collection:
https://www.freshports.org/sysutils/py-qmk/
When the USB device is connected, FreeBSD creates not one, but three
device nodes in /dev, e.g.: /dev/ttyU0, /dev/ttyU0.init, and
/dev/ttyU0.lock.
As a result, this leads to the USB variable containing 3 paths
(and therefore, whitespace) and messages like this one:
Device /dev/ttyU0
/dev/ttyU0.init
/dev/ttyU0.lock has appeared; assuming it is the controller.
This changes fixes the use of the -z flag of "[" (see test(1)). Also, it
removes undesired paths from the USB variable, leaving only
one path there (i.e., "/dev/ttyU0").
Mateusz PiotrowskiandGitHub