August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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11.9. Wykorzystanie polecenia date i mechanizmu cron do uruchomienia skryptu w wybranym dniu
Problem
Chcemy zapewnić wykonywanie skryptu w określonym dniu tygodnia danego miesiąca (na przykład w drugą środę), a większość mechanizmów cron nie umożliwia tego typu operacji.
Rozwiązanie
W treści wykonywanego polecenia trzeba uwzględnić dodatkowy kod warunkowy. Osoby korzystające z mechanizmu Vixie Cron (crontab) dostępnego w większości systemów Linux, mogą dostosować do własnych potrzeb jedną z poniższych instrukcji. Użytkownicy innych programów typu cron być może będą musieli zastąpić nazwy dni tygodnia numerami dni, zgodnie ze składnią obowiązującą w danej aplikacji harmonogramu zadań — niekiedy w miejscu nazwy dnia tygodnia (+%a) trzeba wstawić numer ...
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