August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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5.7. Wykorzystanie parametrów w skryptach powłoki
Problem
Użytkownicy skryptu powinni mieć możliwość wywoływania skryptu wraz z parametrami. Można oczywiście wymusić na użytkownikach powoływanie zmiennych powłoki, ale nie wydaje się to najlepszą metodą. Niezbędne jest również przekazanie danych do innego skryptu. Zmienne środowiskowe były tu pewnym rozwiązaniem, ale zbyt silnie uzależnia ono obydwa skrypty od siebie nawzajem.
Rozwiązanie
Należy wykorzystać parametry wiersza poleceń. Każdy ciąg tekstowy zapisany w wierszu polecenia wywołującego skrypt powłoki jest dostępny dla tego skryptu w numerowanych zmiennych:
# krótki skrypt powłoki echo $1
Powyższy kod powoduje wyświetlenie na ekranie wartość pierwszego parametru wpisanego w poleceniu wywołującym ...
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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.