August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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11.2. Dostarczanie domyślnej wartości daty
Problem
Chcemy, aby skrypt dostarczał domyślną wartość daty i wymagał jej potwierdzenia przez użytkownika.
Rozwiązanie
Dzięki poleceniu GNU date można wygenerować najbardziej prawdopodobny ciąg daty i przypisać go zmiennej, a następnie umożliwić użytkownikowi wprowadzenie stosownych zmian.
#!/usr/bin/env bash # plik receptury: default_date # Wykorzystanie czasu południa zapobiega błędowi, który mógłby powstać # w przypadku uruchomienia skryptu na kilka sekund przed zmianą daty i spowodować # przesunięcie o jeden dzień START_DATE=$(date -d 'last week Monday 12:00:00' '+%Y-%m-%d') while [ 1 ]; do printf "%b" "Data początkowa to: $START_DATE. Czy jest poprawna? (T/nowa data) " read answer # Każda wartość inna ...
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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.