August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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10.8. Pomijanie aliasów i funkcji
Problem
Zdefiniowaliśmy alias lub funkcję, aby przesłonić wywołanie rzeczywistego polecenia, ale teraz chcemy wywołać to rzeczywiste polecenie.
Rozwiązanie
Aby wykonać polecenie, które jest wbudowanym poleceniem powłoki bash, wystarczy wykorzystać instrukcję builtin.
Użycie polecenia command pozwala na zignorowanie aliasów i funkcji podczas uruchamiania programu zewnętrznego.
Jeśli problem dotyczy jedynie konieczności pominięcia aliasu, ale z uwzględnieniem definicji funkcji, należy poprzedzić nazwę polecenia znakiem lewego ukośnika.
Chcąc sprawdzić, jakiego rodzaju kod zostanie wykonany, wystarczy wpisać instrukcję type (ewentualnie z opcją –a).
Oto kilka przykładów zastosowania wymienionych rozwiązań:
$ alias echo='echo ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.