August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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18.5. Powtórne wykorzystanie parametrów
Problem
Dzięki symbolowi !! powtórne wykorzystanie polecenia jest bardzo łatwe. Czasami jednak całe polecenie nie jest potrzebne. Czy można ponownie użyć samych jego parametrów?
Rozwiązanie
Symbol !$ odnosi się do ostatniego polecenia. Aby pobrać pierwszy parametr tego polecenia, wystarczy wpisać !:1. Drugi parametr jest dostępny za pośrednictwem symbolu !:2 itd.
Analiza
Bardzo często użytkownik wykonuje serię poleceń w odniesieniu do tych samych plików. Typowym przykładem jest procedura naprzemiennego edytowania pliku kodu źródłowego i jego kompilowania. Symbol !$ okazuje się wówczas bardzo użyteczny:
$ vi /pewna/długa/ścieżka/którą/wystarczy/wpisać/jeden/raz ... $ gcc !$ gcc /pewna/długa/ścieżka/którą/wystarczy/wpisać/jeden/raz ...
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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.