August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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3.7. Wybór opcji z listy
Problem
Użytkownik powinien zobaczyć listę dostępnych odpowiedzi i mieć możliwość łatwego wyboru jednej z nich.
Rozwiązanie
Rozwiązanie polega na zastosowaniu wbudowanego polecenia powłoki bash select, które służy do generowania menu i umożliwia użytkownikowi wybranie numeru właściwej pozycji.
# plik receptury: select_dir directorylist="Koniec $(for i in /*;do [ -d "$i" ] && echo $i; done)" PS3='Wybierz katalog: ' # Komunikat opisujący listę opcji until [ "$directory" == "Koniec" ]; do printf "%b" "\a\n\nLista dostępnych katalogów:\n" >&2 select directory in $directorylist; do # Choć użytkownik wpisuje wartość liczbową, która jest przechowywana w zmiennej # $REPLY, instrukcja select zwraca ciąg tekstowy opcji if [ "$directory" ...
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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.