August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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5.5. Eksportowanie zmiennych
Problem
W jednym ze skryptów została określona wartość pewnej zmiennej. Próba odwołania się do tej zmiennej w kodzie innego skryptu okazała się jednak błędem.
Rozwiązanie
Zmienne przekazywane do innych skryptów muszą zostać wyeksportowane.
export MYVAR export NAME=wartość
Analiza
Zazwyczaj brak możliwości odwołania się z poziomu jednego skryptu do zmiennych innego jest pożądanym rozwiązaniem. Jeśli skrypt powłoki zostanie wywołany przez instrukcję umieszczoną w pętli for innego skryptu, z pewnością nie powinien on wpływać na przebieg kolejnych iteracji pętli skryptu wywołującego.
Niekiedy jednak możliwość przekazywania informacji jest pożądaną cechą. W takich przypadkach zmienna może zostać wyeksportowana, co oznacza, że ...
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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.