What are the five fields of a cron expression?
In order: minute (0 to 59), hour (0 to 23), day of month (1 to 31), month (1 to 12), and day of week (0 to 7, where 0 and 7 are Sunday). A command runs when the current time matches all the fields, with the day-of-month and day-of-week caveat described in the crontab manual.
Answered in
Cron Expressions and the Gotchas That Bite in ProductionFive fields, four special characters, and a handful of traps: the OR rule, the tiny environment, silent output, overlapping runs and time zones.
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