August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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10.7. Zmiana definicji poleceń za pomocą aliasów
Problem
Chcemy zmienić nieznacznie definicję polecenia, na przykład po to, by zawsze było ono wykonywane ze wskazaną opcją (często polecenie ls jest wykonywane z opcją –a, a instrukcja rm z opcją –i).
Rozwiązanie
Należy wykorzystać mechanizm aliasów, dostępny (tylko) w powłokach interaktywnych. Instrukcja alias jest dostatecznie „inteligentna”, aby przedstawiony poniżej zapis nie stał się definicją pętli nieskończonej.
alias ls='ls –a'
Aby zapoznać się z listą obecnie wykorzystywanych aliasów, wystarczy wprowadzić polecenie alias bez jakichkolwiek opcji. W niektórych dystrybucjach systemów operacyjnych sesje powłoki bash są wstępnie wyposażone w kilka aliasów.
Analiza
Działanie mechanizmu aliasów polega ...
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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.