August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.20. Zamiana strumieni STDERR i STDOUT
Problem
Chcemy zamienić strumienie STDERR i STDOUT, aby można było kierować dane strumienia STDOUT do pliku dziennika, a informacje strumienia STDERR (za pomocą polecenia tee) na ekran i do pliku. Potoki odnoszą się jednak tylko do strumienia STDOUT.
Rozwiązanie
Przed przekazaniem danych do potoku trzeba zamienić strumienie STDERR i STDOUT, wykorzystując do tego celu trzeci deskryptor pliku.
$ ./mójskrypt 3>&1 1>dziennik.stdout 2>&3- | tee –a dziennik.stderrAnaliza
Każde przekierowanie z użyciem deskryptorów plików powoduje zduplikowanie istniejącego deskryptora. Dzięki temu istnieje możliwość podmiany deskryptorów w sposób zbliżony do operacji zamiany dwóch wartości w dowolnym języku programowania — niezbędna ...
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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.