August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.16. Zapisywanie kopii danych wyjściowych mimo wykorzystywania ich jako danych wejściowych
Problem
Chcemy prześledzić działanie długiej sekwencji operacji potokowych. Na przykład:
$ cat moje* | tr 'a-z' 'A-Z' | uniq | awk –f konwersja.awk | wcW jaki sposób można przechwycić dane przekazywane z polecenia uniq do awk bez przerywania potoku?
Rozwiązanie
Rozwiązanie polega na zastosowaniu mechanizmu rozgałęziania potoku. W powłoce bash rozdzielenie strumienia wyjściowego na dwa identyczne strumienie należy do zadań polecenia tee. Dane jednego strumienia są zapisywane w pliku, a drugiego — przekazywane do standardowego strumienia wyjściowego, co pozwala na dostarczenie ich do kolejnego polecenia potoku.
Jeżeli chcemy więc prześledzić działanie długiego ...
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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.