August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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5.8. Iteracyjna analiza parametrów przekazanych do skryptu
Problem
Chcemy wykonać pewne operacje na kilku dostarczonych parametrach. Napisanie skryptu, który wykonuje określone działania w odniesieniu do jednego parametru, nie stanowi żadnego problemu — wystarczy wykorzystać odwołanie typu $1. Rzecz komplikuje się, gdy operacja musi zostać wykonana na pewnym zbiorze danych (np. plików). Załóżmy, że skrypt powinien być wywoływany w następujący sposób:
uwzglwszystkie *.txt
Wiadomo, że powłoka przygotuje listę plików, których nazwy spełniają kryteria dopasowania określone wzorcem *.txt (odpowiadającym wszystkim plikom, których nazwy kończą się na .txt).
Rozwiązanie
Należy wykorzystać specjalną zmienną powłoki $*, która reprezentuje wszystkie parametry ...
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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.