August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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1.8. Sprawdzenie, czy powłoka pracuje w trybie interaktywnym
Problem
Dysponujemy kodem, który powinien być uruchamiany tylko w przypadku pracy powłoki w trybie interaktywnym lub w trybie nieinteraktywnym.
Rozwiązanie
Należy wykorzystać instrukcję case o następującej treści:
#!/usr/bin/env bash
# nazwa pliku receptury: interaktywnosc
case "$-" in
*i*) #Kod powłoki interaktywnej
;;
*) #Kod powłoki nieinteraktywnej
;;
esacAnaliza
Zmienna $- przechowuje ciąg tekstowy wszystkich bieżących opcji powłoki. Jeżeli wśród nich występuje opcja i, powłoka pracuje w trybie interaktywnym.
Można również zastosować skrypt przedstawiony poniżej, ale metoda opisana wcześniej jest rozwiązaniem zalecanym.
if [ "$PS1" ]; then echo Powłoka pracuje w trybie interaktywnym else ...
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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.