August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.5. Zapisywanie danych wyjściowych polecenia
Problem
Chcemy zachować wynik wykonania polecenia, zapisując go w pliku.
Rozwiązanie
Należy zastosować symbol >, informując powłokę o obowiązku skierowania strumienia wyjściowego do pliku. Oto przykład:
$ echo do zapisania w pliku do zapisania w pliku $ echo do zapisania w pliku > plik.txt $
Dla pewności sprawdźmy, czy w pliku zostały zapisane dane wyjściowe polecenia:
$ cat plik.txt
do zapisania w pliku
$Analiza
Pierwszy wiersz przedstawionego przykładu zawiera instrukcję echo z czterema parametrami. Każdy z tych parametrów jest wyświetlany na ekranie. W drugim wierszu kodu został wykorzystany symbol >, który zapisuje dane wyjściowe w pliku o nazwie plik.txt. Z tego powodu po wykonaniu polecenia echo na ...
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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.