I had a look though the cron man but didn't find anything that helped :(
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I'm giving an alternative answer here even though Trevor is correct.
e.g. Ubuntu has an
This is generally defined in
Ubuntu's karmic 9.10 release has the following in
So the weekly crontab in Ubuntu is run at 6.47am on Sunday
Note: when looking for manpages for crontab implementations, you want to use
@weekly is the equivalent to: 0 0 * * 0
So it'll run at 00:00 on the Sunday.