August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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8.3. Sortowanie adresów IP
Problem
Chcemy posortować listę adresów IP. Sortowanie powinno być wykonane względem ostatniego oktetu lub powinno być realizowane logicznie na podstawie całego adresu.
Rozwiązanie
Sortowanie względem ostatniego oktetu (stara składnia):
$ sort –t. –n +3.0 lista.adresów
10.0.0.2
192.168.0.2
192.168.0.4
10.0.0.5
192.168.0.12
10.0.0.20
$Poprawne sortowanie całych adresów IP (składnia POSIX):
$ sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n lista.adresów
10.0.0.2
10.0.0.5
10.0.0.20
192.168.0.2
192.168.0.4
192.168.0.12
$Analiza
Ponieważ dane mają charakter liczbowy, do polecenia została dodana opcja –n. Opcja –t natomiast wskazuje znak, który powinien być uznany za separator pól (w tym przypadku separatorem jest kropka). Dzięki niemu ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.