What does -q and -O mean?

Question

What does -q and -O mean in the following cronjob?

*/30 * * * * /usr/bin/wget -q -O /dev/null http://example.com/moodle/admin/cron.php

Answer 1

They are actually options for the wget command and not to do with cron's operation.

-q tells wget to operate quietly (ie. to not output the usual status information)
-O /dev/null tells it to output to /dev/null

Type man wget for more info on wget's operation and options.

Answer 2

You can find this in wget manpage.
-O is the location where the file is save, here the file will be trashed
-q is to suppress console output