August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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15.1. Przenośność skryptu — problem wiersza #!
Problem
Musimy uruchomić skrypt powłoki w kilku systemach, ale interpreter bash nie zawsze jest umieszczony w tym samym katalogu (zagadnienie to zostało również opisane w „1.11. Pobranie interpretera bash dla systemu BSD”).
Rozwiązanie
Należy wykorzystać polecenie /usr/bin/env w następujący sposób: #!/usr/bin/env bash. Jeżeli w danym systemie program env nie jest zapisany w katalogu /usr/bin, trzeba poprosić administratora, aby go tam zainstalował, przeniósł lub utworzył dowiązanie symboliczne do odpowiedniego pliku. Na przykład w systemie Red Hat plik ten domyślnie jest zapisywany w katalogu /bin (/bin/env), ale jednocześnie tworzone jest stosowne dowiązanie symboliczne.
Oczywiście, można by również ...
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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.