August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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15.6. Przenośność instrukcji echo
Problem
Dany skrypt musi działać poprawnie w różnych wersjach systemów Unix i Linux. Wykorzystywana w nim instrukcja echo musi więc realizować zadania w jednakowy sposób, nawet jeśli na danej platformie nie jest dostępny interpreter bash.
Rozwiązanie
Rozwiązanie polega na zastosowaniu polecenia printf "%b" dowolna treść lub na sprawdzeniu wersji systemu i włączeniu opcji xpg_echo za pomocą instrukcji shopt –s xpg_echo.
Pominięcie symbolu "%b" (zapisanie instrukcji printf dowolna treść) spowoduje, że polecenie printf będzie interpretowało wszystkie symbole rozpoczynające się od znaku %, które występują w ciągu dowolna treść. Specyfikator formatu "%b" jest rozszerzeniem standardowego mechanizmu formatowania instrukcji ...
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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.