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sai kumar 49sai kumar 49 

What is cronExpression ?

Amit Chaudhary 8Amit Chaudhary 8

Contains schedule information for a scheduled job. CronTrigger is similar to a cron job on UNIX systems. This object is available in API version 17.0 and later.

Sample Cron Job Code 
scheduledMerge m = new scheduledMerge();
String sch = '20 30 8 10 2 ?';
String jobID = system.schedule('Merge Job', sch, m);

https://www.salesforce.com/developer/docs/api/Content/sforce_api_objects_crontrigger.htm

http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_scheduler.htm

Please let us know if this will help you.