August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.1. Przekazywanie danych wyjściowych do okna terminala
Problem
Chcemy za pomocą polecenia powłoki wyświetlić dane na ekranie.
Rozwiązanie
Należy zastosować wbudowaną instrukcję echo. Wszystkie parametry polecenia zostaną wyświetlone na ekranie. Na przykład instrukcja:
echo Proszę czekać.
spowoduje wyświetlenie tekstu:
Proszę czekać.
co można zaobserwować, wprowadzając powyższą instrukcję w wierszu poleceń powłoki bash (o aktywnej sesji bash świadczy znak $):
$ echo Proszę czekać.
Proszę czekać.
$Analiza
Polecenie echo jest jednym z najmniej skomplikowanych poleceń spośród wszystkich instrukcji powłoki bash. Jego zadanie sprowadza się do wyświetlenia na ekranie wszystkich parametrów wywołania. Korzystając z niego, trzeba jednak pamiętać o kilku rzeczach. ...
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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.