August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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6.5. Sprawdzanie właściwości ciągów tekstowych
Problem
Chcemy, żeby przed wykorzystaniem ciągu tekstowego skrypt sprawdził jego wartość. Sam ciąg tekstowy może zostać przekazany do programu przez użytkownika, może zostać odczytany z pliku lub dostarczony za pośrednictwem zmiennej powłoki.
Rozwiązanie
Dzięki wbudowanemu poleceniu test interpreter bash może wykonać kilka podstawowych testów, definiowanych pomiędzy znakami nawiasu kwadratowego instrukcji if. Weryfikacja może obejmować sprawdzenie, czy zmienna przechowuje jakikolwiek tekst lub czy dwie zmienne przechowują ten sam tekst.
Analiza
Przykładowy kod:
#!/usr/bin/env bash # plik receptury: checkstr # # instrukcja if sprawdza, czy # długość ciągu tekstowego jest większa od zera # # wykorzystano ...
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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.