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Cron Specification

 
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Hello,

If the "Cron specification" is 0 0 0/4 * * ?, does that mean that the job will run every 4 hours a day? What does the ? mean in the cron specification?

Thank you,
-Shruti
 
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http://en.wikipedia.org/wiki/Cron
 
Don't get me started about those stupid light bulbs.
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