August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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3.4. Wcinanie osadzonych dokumentów
Problem
Osadzone dokumenty znacznie ułatwiają tworzenie skryptów, ale jednocześnie wprowadzają pewien bałagan w formatowaniu kodu. Chcemy mieć więc możliwość wcinania ich treści, co zwiększy przejrzystość kodu.
Rozwiązanie
Wystarczy zastosować operator (<<-). Można wówczas na początku każdego wiersza wstawić znaki tabulacji (tylko znaki tabulacji!).
$ cat mójskrypt.sh
...
grep $1 <<-'EOF'
W tym miejscu
można wstawić dużą ilość danych.
Początkowe znaki tabulacji
pozwalają na zachowanie wcięć obowiązujących w skrypcie,
ale są pomijane podczas
odczytywania tekstu.
EOF
ls
...
$Analiza
Znak myślnika występujący za znakami mniejszości stanowi dla powłoki bash informację o tym, że należy zignorować początkowe znaki tabulacji. ...
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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.