try to fix shellcheck linter errors with xe-linux-distribution.
try to fix shellcheck linter errors with xe-linux-distribution.

jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic