August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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5.6. Wyświetlanie wartości wszystkich zmiennych
Problem
W jaki sposób można sprawdzić, które zmienne zostały wyeksportowane i jakie mają wartości? Czy trzeba każdą z nich wyświetlać za pomocą instrukcji echo? Skąd wiadomo, że zostały wyeksportowane?
Rozwiązanie
Aby wyświetlić wartości wszystkich zmiennych oraz definicje funkcji danej powłoki, należy użyć polecenia set.
Wyświetlenie zestawienia wszystkich wyeksportowanych zmiennych (i dostępnych w podpowłoce) należy do zadań polecenia env (lub export –p).
Analiza
Polecenie set wywołane bez jakichkolwiek parametrów przekazuje do strumienia wyjściowego listę wszystkich bieżących zmiennych powłoki wraz z ich wartościami w formacie nazwa=wartość. Działanie instrukcji env jest zbliżone. Wykonanie jednego ...
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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.