August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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13.2. Przetwarzanie parametrów z własnymi komunikatami o błędach
Problem
Do przetwarzania opcji dostarczanych do skryptu jest wykorzystywana instrukcja getopts, która w przypadku nieodpowiedniego zdefiniowania wiersza polecenia generuje własne, nieciekawe komunikaty o błędach. Czy można używać instrukcji getopts z własnym mechanizmem obsługi błędów?
Rozwiązanie
Aby wyłączyć w poleceniu getopts funkcję generowania informacji i zgłaszania błędów, wystarczy przed rozpoczęciem przetwarzania opcji przypisać zmiennej $OPTERR wartość 0. Jeśli jednak instrukcja getopts powinna dostarczać pewne informacje, ale bez komunikatów o błędach, należy na początku listy opcji umieścić znak dwukropka (w jednym z komentarzy poniższego skryptu została umieszczona strzałka ...
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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.
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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.