August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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7.14. Zliczanie wartości tekstowych
Problem
Chcemy zliczyć wystąpienia kilku różnych ciągów tekstowych, w tym również ciągów, których wartość nie jest uprzednio znana. Innymi słowy, zadanie nie polega na ustaleniu liczby znanych fraz, ale na wyznaczeniu liczby pewnych ciągów tekstowych, które występują w bloku danych i w czasie zliczania są nieznane użytkownikowi.
Rozwiązanie
Do zliczania trzeba wykorzystać tablice asocjacyjne (zwane też tablicami mieszającymi) narzędzia awk.
Przykładem może być poniższy kod, który ustala, ile plików należących do różnych użytkowników jest zapisanych w systemie. Nazwa użytkownika jest trzecim elementem każdego wiersza wygenerowanego przez polecenie ls –l. Pole to ($3) zostanie wykorzystane jako indeks w tablicy, a ...
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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.