August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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3.5. Pobieranie danych od użytkownika
Problem
Trzeba pobrać dane od użytkownika.
Rozwiązanie
Należy zastosować polecenie read:
read
lub
read –p "tu wpisz odpowiedź: " ANSWER
lub
read PRE MID POST
Analiza
Podstawowa składnia polecenia read (pozbawiona parametrów) zapewnia pobranie danych od użytkownika i przekazanie ich do zmiennej powłoki REPLY.
Jeżeli przed odczytaniem danych użytkownika instrukcja read powinna wyświetlić komunikat, wystarczy dodać do polecenia opcję –p. Wyraz zapisany za opcją –p będzie wyświetlony jako monit. Jeśli komunikat musi się składać z większej liczby słów, trzeba je otoczyć znakami cudzysłowu. Należy również pamiętać o uwzględnieniu na końcu komunikatu odpowiedniego znaku interpunkcyjnego lub spacji, ponieważ podczas oczekiwania ...
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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.