August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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13.12. Wyodrębnianie określonych pól listingu danych
Problem
Chcemy wyodrębnić pole lub większą liczbę pól z każdego wiersza listingu wynikowego.
Rozwiązanie
Jeżeli wskazanie ograniczników pól nie stanowi większej trudności, można zastosować polecenie cut. Wykona ono swoje zadanie nawet wówczas, gdy wyznaczniki początku i końca pola są różne:
# Oto prosty sposób pobrania informacji o nazwach kont, katalogach domowych oraz
# powłokach wykorzystywanych przez użytkowników systemu NetBSD
$ cut -d':' -f1,6,7 /etc/passwd root:/root:/bin/bash bin:/bin:/sbin/nologin daemon:/sbin:/sbin/nologin operator:/root:/sbin/nologin games:/usr/games:/sbin/nologin gopher:/var/gopher:/sbin/nologin ftp:/var/ftp:/sbin/nologin nobody:/:/sbin/nologin named:/var/named:/sbin/nologin ...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.