August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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6.12. Pętla ze zliczaniem iteracji
Problem
Pętla powinna zostać wykonana określoną liczbę razy. Oczywiście, można by do tego celu wykorzystać pętlę while wraz z mechanizmem zliczania i sprawdzania liczby wykonanych iteracji, jednak większość języków programowania udostępnia pętlę for, która realizuje tego typu zadania. Czy można jej użyć również w powłoce bash?
Rozwiązanie
Należy wykorzystać specjalną składnię instrukcji for, która przypomina analogiczną konstrukcję programową języka C, ale ujętą w dwa nawiasy okrągłe.
$ for (( i=0 ; i < 10; i++ )) ; do echo $i ; doneAnaliza
W początkowych wersjach powłoki bash składnia instrukcji for umożliwiała jedynie iteracyjne wykorzystanie ustalonej liczby elementów. Jak na skryptowe języki powłoki była to całkiem ...
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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.