Special strings

Special String Meaning
@reboot Run once, at system startup (non-standard)
@yearly Run once every year, "0 0 1 1 *" (non-standard)
@annually (same as @yearly) (non-standard)
@monthly Run once every month, "0 0 1 * *" (non-standard)
@weekly Run once every week, "0 0 * * 0" (non-standard)
@daily Run once each day, "0 0 * * *" (non-standard)
@midnight (same as @daily) (non-standard)
@hourly Run once an hour, "0 * * * *" (non-standard)
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