November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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21.3. Przetwarzanie argumentów wiersza polecenia
Problem
Chcemy, aby program w Ruby pobierał argumenty wiersza polecenia w sposób charakterystyczny dla większości programów uniksowych.
Rozwiązanie
Aby interpretować argumenty wiersza polecenia jako łańcuchy, wystarczy przetwarzać w pętli tablicę ARGV.
Poniżej zamieszczono wersję uniksowego polecenia cat w języku Ruby. Polecenie to pobiera listę plików, otwiera każdy z nich i wyświetla jego zawartość na standardowym urządzeniu wyjściowym:
#!/usr/bin/ruby -w
# cat.rb
ARGV.each { |filename| IO.readlines(filename).each { |line| puts line } }
Aby interpretować argumenty wiersza polecenia jako nazwy plików, które mają być otwierane i przetwarzane wiersz po wierszu, można użyć tablicy ARGF ...
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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.