August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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13.16. Przetwarzanie pól o stałej długości
Problem
Chcemy odczytać i poddać analizie dane, które są zapisywane w polach o określonej długości.
Rozwiązanie
Należy wykorzystać interpreter Perl lub program gawk w wersji 2.13 bądź późniejszej. Załóżmy, że plik danych zawiera następujące informacje:
$ cat stała_długość
Kolumna1------------Kolumna2----------------------Kolumna3
Rekord1 Pole1 Rekord1 Pole2 Rekord1 Pole3
Rekord2 Pole1 Rekord2 Pole2 Rekord2 Pole3
Rekord3 Pole1 Rekord3 Pole2 Rekord3 Pole3Przetwarzanie danych można zlecić programowi GNU gawk, ustawiając odpowiednią długość pól w zmiennej FIELDWIDTHS, wyznaczając odpowiednią wartość zmiennej OFS oraz definiując operację przypisania w taki sposób, aby mechanizm gawk mógł przepisać dany rekord ...
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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.