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Re: RFC - Issue a warning "-np better written as -p"

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Nicholas Clark
June 17, 2021 06:22
Re: RFC - Issue a warning "-np better written as -p"
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On Wed, Jun 16, 2021 at 11:36:39AM -0400, Dan Book wrote:
> On Wed, Jun 16, 2021 at 4:51 AM Nicholas Clark <> wrote:
> > becomes our next test RFC.
> >
> I don't think it's particularly useful to warn about this. Nothing is
> broken or potentially broken by specifying unnecessary switches. I would
> suggest it could become an optional warning if and when we add support for
> that, but this would only come up for oneliners which are not likely to go
> to the effort of enabling optional warnings of any sort.

I'm going to guess the same for one-liners - they likely won't invoke
warnings. (The numbers from the Debian source searches suggest this)

But it can't be an *optional* warning, because if it is going to warn, it
needs to be enabled by '-w' on the command line, and I doubt that we're
going to change '-w' to be "optional too", or however we do it. I'd assume
that '-w' needs to keep meaning `use warnings`

However, skimming the source search results suggests that it's mostly
written as '-np'. And we document that '-p' overrides '-n', so this common
ordering is consistent with actual behaviour.

Maybe we should warn on '-pn' - ie order matters too - '-n' flag ignored.

Maybe not changing anything is best. I already said that I didn't know :-)

Nicholas Clark

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