field allowed values
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Minute 0-59
hour 0-23
day of month 1-31
month 1-12 (or names, see below)
day of week 0-7 (0 or 7 is Sun, or use names)
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Minute – Hour – Day of Month – Month – Day of Week
* * * * * Command goes here
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How to find
info crontab | grep -A 6 -i ‘allowed values’
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