> Hmm.. double negation is always confusing to me. :-/ How about making
> it a boolean option that sets "task_only" variable?
Ok.
> Also need to update the doc. And what if user gives -P and -T options
> at the same time?
Is something like this is enough (or you'd like some printout with error
details)?
if (!proc_num && task_only)
usage_with_options(timechart_usage, options);
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