Which of the following crontab entries will execute myscript at 30 minutes past every hour on Sundays?

A.

0 * * * 30 myscript

B.

30 * * * 6 myscript

C.

30 0 * * 0 myscript

D.

30 0-23 * * 0 myscript

E.

0 0-23 * * 30 myscript

題解

crontab的欄位分別是分鐘、小時、日期、月份、星期、指令。選項D是正確答案。