August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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7.10. Zachowanie części listingu wynikowego
Problem
Chcemy zachować określone fragmenty listingu wynikowego i odrzucić pozostałą część.
Rozwiązanie
Poniższa instrukcja zapewnia wyświetlenie pierwszego wyrazu z każdego wiersza danych wejściowych:
$ awk '{print $1}' plik.wejściowyWyrazy są rozdzielane dowolnymi znakami odstępu. Narzędzie awk odczytuje informacje z pliku o podanej nazwie lub dostarczone za pomocą standardowego strumienia wejściowego (jeśli nazwa pliku nie została określona). Możliwe jest więc również przekierowanie danych z pliku w następujący sposób:
$ awk '{print $1}' < plik.wejściowyNic również nie stoi na przeszkodzie, żeby dane zostały przekazane za pomocą potoku:
$ cat plik.wejściowy | awk '{print $1}'Analiza
Program awk można wykorzystywać ...
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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.