August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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3.2. Umieszczenie danych w skrypcie
Problem
Działanie skryptu wymaga dostarczenia danych, które nie powinny być zapisane w oddzielnym pliku.
Rozwiązanie
Należy zastosować mechanizm osadzania dokumentu (ang. here-document), dostarczający tekst z wiersza polecenia, a nie z pliku. Wykorzystanie tego rozwiązania w skrypcie pozwala na zapisanie przetwarzanych danych wraz z kodem tego skryptu.
Oto przykład skryptu powłoki zapisanego w pliku o nazwie wew:
$ cat wew
#
# Oto osadzony dokument:
#
grep $1 <<EOF
Michał x.123
Jan x.234
Ala x.555
Piotr x.818
Ania x.822
Bartek x.919
EOF
$Pozwala on na wyszukiwanie wpisów w nieskomplikowanej książce telefonicznej dla numerów wewnętrznych:
$ ./wew Ala
Ala x.555
$lub:
$ ./wew 555
Ala x.555
$Analiza
Polecenie grep odpowiada ...
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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.