August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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3.1. Pobieranie danych wejściowych z pliku
Problem
Dane dla poleceń powłoki powinny być odczytywane z pliku.
Rozwiązanie
Należy wykorzystać mechanizm przekierowania danych wejściowych. Zastosowanie operatora < spowoduje odczytanie danych z pliku.
$ wc < mój.plikAnaliza
Podobnie jak operator > powoduje zapisanie danych w pliku, operator < umożliwia pobranie informacji z pliku. Symbole przekierowania zostały dobrane w taki sposób, aby można było wizualnie ocenić kierunek przepływu danych. Wyznacza go grot strzałki.
Wiele poleceń powłoki jako parametry wywołania pobiera nazwę lub nazwy plików. Jeśli jednak żadna nazwa pliku nie zostanie zdefiniowana, odczytywane są informacje standardowego strumienia wejściowego. Wspomniane polecenia mogą być definiowane ...
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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.