August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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19.12. Sprawdzanie składni skryptu powłoki
Problem
Edytujemy treść skryptu powłoki i chcemy mieć pewność, że jego składnia jest poprawna.
Rozwiązanie
Wystarczy dodać do wywołania bash opcję –n. Czynność tę należy powtarzać często, najlepiej po każdym zapisie pliku, a na pewno przed zatwierdzeniem zmian w systemie kontroli wersji:
$ bash -n mój.skrypt $ $ echo 'echo "Błędna instrukcja' >> mój.skrypt $ $ bash -n mój.skrypt mój.skrypt: line 2: unexpected EOF while looking for matching `"' mój.skrypt: line 3: syntax error: unexpected end of file
Analiza
Opis opcji –n trudno odnaleźć na stronie podręcznika systemowego dotyczącej powłoki bash lub w innych materiałach informacyjnych. Jest on bowiem zamieszczony w sekcji odnoszącej się do wbudowanego polecenia ...
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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.