No output when insufficient parameters given on the commandline

[Bruce Cran]

When an incomplete job file is run, fio displays an error - but when 
insufficient parameters are specified on the commandline, fio just exits 
with no messages:

> fio --iodepth 32
>
> fio --filename test --iodepth 8 --rw randrw --size 4g --thread 
--runtime 120 --time_based
> echo $?
0
>

--
Bruce
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