- load sysconfig/clamd first, then act (broken in 1.8),
- get rid of intermediate variables (messed in 1.8),
- again, compare integers with -eq not =,
- numeric output of `date +%[kH]` doesn't need LC_ALL,
- finally, it's _divisor_ which mustn't be equal to 0, not divident!
previous test disabled updates at midnight.