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1.set aa=%date:~0,4%2.set bb=%date:~5,2%3 set bb=%date:~8,2%note: date variable have two parameter, one is statr bit,other is long4.example:exp scott/tiger file=c:scott%aa%%bb%%cc%.dmp log=scott%aa%%bb%%cc%5.create a schedule in task manager for backup.6.fininish[@more@]