CRON Expression
A CRON expression is a string comprising 5 or 6 fields separated by white space that represents a set of times, normally as a schedule to execute some routine.
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“The true poem is not that which the public read. There is always a poem not printed on paper,... in the poet’s life. It is what he has become through his work. Not how is the idea expressed in stone, or on canvas or paper, is the question, but how far it has obtained form and expression in the life of the artist. His true work will not stand in any prince’s gallery.”
—Henry David Thoreau (1817–1862)