August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.14. Zapisywanie i grupowanie danych wyjściowych większej liczby poleceń
Problem
Chcemy zarejestrować informacje za pomocą przekierowania, wprowadzając jednocześnie kilka instrukcji w jednym wierszu.
$ pwd; ls; cd ../gdzieś; pwd; ls > /tmp/wszystko.txtMechanizm przekierowania obejmuje jednak tylko ostatnie polecenie — ostatnią instrukcją ls w wierszu. Dane wyjściowe wszystkich pozostałych poleceń są wyświetlane na ekranie (nie są przekierowane do pliku).
Rozwiązanie
Użycie znaków nawiasu klamrowego ({}) pozwala na grupowanie poleceń. Dzięki temu operacja przekierowania dotyczy danych wyjściowych wygenerowanych przez wszystkie zgrupowane instrukcje. Oto przykład:
$ { pwd; ls; cd ../gdzieś; pwd; ls; } > /tmp/wszystko.txtOstrzeżenie
W rozwiązaniu tym ...
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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.