August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.13. Odrzucanie danych wyjściowych
Problem
Niekiedy nie ma potrzeby zapisywana danych wyjściowych w pliku. Co więcej zdarzają się sytuacje, w których w ogóle nie jesteśmy zainteresowani oglądaniem wyniku.
Rozwiązanie
Dane wyjściowe powinny zostać skierowane do urządzenia /dev/null zgodnie z poniższym przykładem.
$ find / -name mójplik –print 2> /dev/nulllub
$ program >/dev/null 2>&1Analiza
Można oczywiście skierować niechciane dane wyjściowe do pliku, a po zakończeniu prac plik ten usunąć. Istnieje jednak łatwiejsze rozwiązanie. Systemy Unix i Linux dysponują specjalnym urządzeniem, które nie jest rzeczywistym komponentem sprzętowym, ale pewnego rodzaju koszem na śmieci, do którego wyrzuca się wszystkie niepotrzebne dane. Urządzenie to nazywa się ...
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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.