On Fri, Apr 26, 2019 at 12:19:09PM +0100, mick crane wrote: > sorry to be a nuisance
You are not (not to me, at least :-)
> can somebody explain generally what this scheme of things with the
> dots has to do with ?
> seen this in perl as the kind of hierarchy of modules but how is
> this to do with the OS ?
>
> ~$ apropos nameserver
> Net::DNS::Nameserver (3pm) - DNS server class
You mean those double colons ('::')?
If yes: those are just separators for the Perl module namespace, which
conceptually is a hierarchy. At the (right) end you can put some object
(function, variable) living in that module's [1] namespace.
Those are just a device to subdivide the namespace and to organize
file system "places" [1] -- they have no intrinsic "meaning" to perl
(i.e. the language itself has no notion of "Net" or "Net::DNS" -- just
of "Net::DNS::Nameserver").
Cf "perldoc -f require" for the full thing :-)
Cheers
[1] In Perl parlance, it is a "package".
[2] Typically you'll find the package code in Net/DNS/Nameserver.pm
under a suitable "module root", e.g. /usr/share/perl5. The whole
list of roots is in the special array variable @INC.
-- tomás
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