August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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7.5. Przeszukiwanie danych przekazywanych w potoku
Problem
Chcemy odszukać określony ciąg tekstowy, ale ciąg ten nie jest zapisany w pliku. Jest on natomiast fragmentem listingu wynikowego pewnego polecenia lub elementem danych wyjściowych potoku poleceń.
Rozwiązanie
Dane wynikowe należy przekazać za pomocą potoku do polecenia grep.
$ potok | poleceń | grep
Analiza
Jeśli w wywołaniu polecenia grep nie zostanie uwzględniona nazwa pliku, program odczyta dane ze standardowego strumienia wejściowego. Podobnie działa większość poprawnie przygotowanych narzędzi powłoki. Ta cecha właśnie czyni je tak użytecznymi elementami składowymi skryptów.
Jeżeli działaniem polecenia grep mają być również objęte komunikaty o błędach, trzeba pamiętać, aby dane standardowego ...
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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.