August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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19.14. Unikanie komunikatów „command not found” podczas korzystania z funkcji
Problem
Wielokrotnie korzystaliśmy z języków programowania, takich jak Perl, które pozwalają na umieszczenie wywołania funkcji w sekcji kodu, który jest zapisany przed definicją tej funkcji. W skryptach bash takie rozwiązanie nie działa poprawnie.
Rozwiązanie
Skrypty powłoki są odczytywane i wykonywane „wiersz po wierszu” od początku do końca pliku. Funkcje muszą więc być zdefiniowane przed ich wywołaniem.
Analiza
W niektórych językach programowania, w takich jak Perl, interpretacja kodu składa się z kilku etapów pośrednich. Dzięki nim cały skrypt jest analizowany jako jeden moduł. Rozwiązanie to umożliwia zapisanie kodu funkcji main() przed wywoływanymi funkcjami (lub procedurami). ...
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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.