Simon Kelley <si...@thekelleys.org.uk> 于2019年10月8日周二 上午1:51写道:
>
> On 02/10/2019 07:25, Geert Stappers wrote:
> > On Wed, Oct 02, 2019 at 11:16:18AM +0800, Hongyi Zhao wrote:
> >> Hi,
> >>
> >> The manpage said that:
> >>
> >> ---
> >>       -H, --addn-hosts=<file>
> >>               Additional hosts file.  Read  the  specified  file  as  well 
> >>  as
> >>               /etc/hosts.  If  --no-hosts  is  given,  read only the 
> >> specified
> >>               file. This option may be repeated for more than  one  
> >> additional
> >>               hosts  file.  If  a  directory is given, then read all the 
> >> files
> >>               contained in that directory.
> >>
> >>        --hostsdir=<path>
> >>               Read all the hosts files contained  in  the  directory.  New 
> >>  or
> >>               changed  files  are  read automatically. See --dhcp-hostsdir 
> >> for
> >>               details.
> >> ---
> >>
> >> According to the above description, the --addn-hosts can do all the
> >> things done by  --hostsdir,
> >
> > No.
> >
> > The difference is
> >    New or changed files are read automatically.
> >
> >
> >
>
> What he said. And the reason they both exist is that --addn-hosts
> existed first, and when the ability to automatically read files was
> added, there was a desire not to introduce bugs in existing
> configurations by subtly changing the behaviour of the existing option.

Thanks for pointing out this.

>
>
> Simon.
>
>
>
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-- 
Hongsheng Zhao <hongyi.z...@gmail.com>
Institute of Semiconductors, Chinese Academy of Sciences
GnuPG DSA: 0xD108493

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