On Sat, Jul 07, 2001 at 12:43:42PM +0200, Martin F. Krafft wrote: > this is not right. if only DOW is specified, then these backups will > only happen friday or saturday, no matter what day of the month it is.
You're doing fine so far... > if you were to specify both, DOW and DOM, then it would only execute > whenever the e.g. 8th of a month is a friday. But this is wrong. According to man 5 crontab, if both DOM and DOW are given, they are ORed together, not ANDed: Note: The day of a command's execution can be specified by two fields -- day of month, and day of week. If both fields are restricted (ie, aren't *), the command will be run when either field matches the current time. For exam ple, ``30 4 1,15 * 5'' would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday.