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Re^2: How to sort IP addresses

by rinceWind (Monsignor)
on Jan 30, 2007 at 10:36 UTC ( [id://597330]=note: print w/replies, xml ) Need Help??


in reply to Re: How to sort IP addresses
in thread How to sort IP addresses

That's cool! Admittedly, you might be restricted as to perl versions, since it relies on vstring functionality. It occurred to me that there might be a golf like solution involving some kind of GRT. It's probably quite fast as well.

I'll even name it for you: the Gutta Percha Transform :).

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Re^3: How to sort IP addresses
by AltBlue (Chaplain) on Jan 31, 2007 at 10:37 UTC
    Hm, golfing with GRT? No idea how, but anyway, here's a possible starting point:
    $ perl -le '$,=$/; print @ARGV[ map { unpack N, substr $_, -4 } \ sort map { eval("v$ARGV[$_]") . pack N, $_ } 0 .. $#ARGV ]' \ 1.2.1.1 1.1.1.1 1.11.1.1 1.1.1.66 1.1.1.9 1.1.1.1 1.1.1.9 1.1.1.66 1.2.1.1 1.11.1.1
    OTOH, that previous version could easily be golfed (ok, just a little) by dropping the initial map (which is useful only when using this snippet "for real" - you know, using sprintf and returning a list):
    $ perl -e 'printf "%vd\n", $_ for sort map { eval "v$_" } @ARGV' \ 1.2.1.1 1.1.1.1 1.11.1.1 1.1.1.66 1.1.1.9 1.1.1.1 1.1.1.9 1.1.1.66 1.2.1.1 1.11.1.1

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