August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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8.4. Wycinanie fragmentów listingu wynikowego
Problem
Na ekranie powinna zostać wyświetlona jedynie pewna część listingu kolumnowego lub listingu o stałych długościach wierszy. Fragment przeznaczony do wyświetlenia można wyznaczyć na podstawie informacji o położeniu kolumny.
Rozwiązanie
Aby wyodrębnić określoną kolumnę, wystarczy zastosować instrukcję cut z opcją –c. Wykorzystane w kolejnym przykładzie polecenie ps działa tylko w niektórych systemach, tj. w systemach CentOS-4, Fedora Core 5 i Ubuntu. W systemach Red Hat 8, NetBSD, Solaris i Mac OS X listing wynikowy będzie nieczytelny z uwagi na inne rozmieszczenie kolumn.
$ ps -l | cut -c12-15
PID
6812
6934
6935
$Inny przykład użycia polecenia cut:
$ ps –elf | cut –c58- (listing wynikowy został pominięty) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.