[gradsusr] merging time steps

[kombo kai]

Hi grad users 
I have the daily average ssts for 30 years in separate daily files. I want to merge the time steps of the files so a to have a single file having the daily average data for the whole 3o years period.
It is easy to do with CDO but i fail to do it with grads
please any one to direct me about this
regards
kaikombo

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