August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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11.6. Pobranie daty poprzedniego lub kolejnego dnia w języku Perl
Problem
Chcemy pobrać datę poprzedniego lub następnego dnia, mimo że w systemie nie jest zainstalowany program date z repozytorium GNU. Jest natomiast dostępny interpreter Perl.
Rozwiązanie
Rozwiązanie polega na wykorzystaniu poniższych poleceń Perl z odpowiednią liczbą sekund, które są dodawane do ustalonej daty lub od niej odejmowane.
# Dzień poprzedni o tym samym czasie (odejmowanie wartości) $ perl -e "use POSIX qw(strftime); print strftime('%Y-%m-%d', localtime(time - 86400)), qq(\n);" # Dzień następny o tym samym czasie (dodawanie wartości) $ perl -e "use POSIX qw(strftime); print strftime('%Y-%m-%d', localtime(time + 86400)), qq(\n);"
Analiza
Przedstawione rozwiązanie jest szczególnym ...
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