August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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13.3. Interpretacja kodu HTML
Problem
Chcemy wyodrębnić określone ciągi tekstowe z kodu HTML. Przykładem może być konieczność pobrania fragmentu href="adresurl" ze znacznika <a> umieszczonego w dokumencie HTML.
Rozwiązanie
Jeżeli problem dotyczy rozwiązania, które powinno być przygotowane szybko i nie musi mieć uniwersalnego charakteru, wystarczy wykorzystać następujące polecenie:
cat plik | sed –e 's/>/>\ /g' | grep '<a' | while IFS='"' read a b c ; do echo $b; done
Analiza
Interpretacja dokumentu HTML w skrypcie powłoki bash jest dość trudna, ponieważ interpreter bash przetwarza dane wiersz po wierszu, natomiast interpretery HTML są zaprojektowane w taki sposób, aby traktowały znaki nowego wiersza jako znaki odstępu. Zapisywanie znaczników w kilku ...
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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.