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Quoting the fine crontab(5) manual:
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 cur-
rent time. For example,
``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.
How can you run a command when _both_ fields match?
If the rule were _both_ and I wanted _either_, I could write 2 lines
in crontab. The opposite isn't obvious to me. A use case for _both_
would be "run this backup every Friday unless it's the first of the
month (because the different monthly backup is running)" - and I can't
believe I'm the first one to encounter this ;-)
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