August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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19.15. Pomyłki w stosowaniu symboli wieloznacznych powłoki i wyrażeń regularnych
Problem
Niekiedy wyrażenia są zapisywane za pomocą symboli .*, niekiedy jako *, a czasami jest to zapis [a-z]*. Zazwyczaj jednak taka definicja oznacza coś zupełnie innego, niż początkowo sądziliśmy. Wykorzystanie wyrażeń regularnych w kodzie grep lub sed nie stanowi problemu. Jednak nie sprawdza się w przypadku niektórych instrukcji powłoki bash.
Rozwiązanie
Przyczyną niejasności może być natłok informacji związany z nauką zbyt wielu rzeczy naraz lub zbyt rzadkie wykorzystywanie opisywanego mechanizmu. Nie można się jednak poddawać, bo, jak wiadomo, praktyka czyni mistrza.
Zasady nie są trudne do zapamiętania. W końcu wyrażenia regularne są wykorzystywane w powłoce ...
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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.