August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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13.15. Kompresowanie znaków odstępu
Problem
W pliku występuje seria znaków odstępu (treść pliku jest dopełniana określoną liczbą znaków spacji). Chcemy zastąpić wszystkie znaki odstępu pojedynczym znakiem pełniącym funkcję ogranicznika.
Rozwiązanie
Należy w odpowiedni sposób wykorzystać polecenie tr lub mechanizm awk.
Analiza
Chcąc skompresować serię znaków odstępu do jednego znaku, można zastosować polecenie tr, ale trzeba mieć świadomość ryzyka zniszczenia pliku, jeśli nie jest on właściwie sformatowany. Na przykład jeżeli poszczególne pola są wyznaczane za pomocą kilku znaków odstępu, ale w treści tych pól występują znaki spacji, zastąpienie wielu wystąpień znaku spacji jednym uniemożliwi rozróżnienie pól. Nietrudno się domyślić, jaki byłby rezultat ...
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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.