August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.12. Pomijanie nagłówka pliku
Problem
W pliku występuje jeden wiersz nagłówka lub większa liczba takich wierszy. Musimy przetworzyć treść pliku z pominięciem jego nagłówka.
Rozwiązanie
Należy zastosować polecenie tail ze specjalną opcją. Aby na przykład pominąć pierwszy wiersz pliku, wystarczy wprowadzić polecenie:
$ tail –n +2 plik
Wiersz 2
Wiersz 3
Wiersz 4
Wiersz 5Analiza
Parametr polecenia tail poprzedzony znakiem minus (-) wyznacza wartość przesunięcia względem końca pliku. Zatem polecenie tail -10 plik powoduje wyświetlenie dziesięciu ostatnich wierszy z pliku plik (co jednocześnie jest domyślnym sposobem działania polecenia). Wartość liczbowa poprzedzona znakiem plus (+) jest natomiast definicją przesunięcia wyznaczanego w odniesieniu do początku ...
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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.
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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.