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Datastage interview questions

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What is the stage from which you can write unix command on datastage

One sequential file having 100 rec output need to be in 5 different files 1 rec- 1 file 2rec-2file... again repeat what stages you use and explain

Two sequential files with common coulmn but different values output need to club all of them into single sequential file

One file consists of four columns with sno and marks output need to be avg of marks based on roll no

In a sequential file how do you eliminate header and footer and read the middle data

What is use of pool in the configuration file

Using unix command how do you read the 90th record

what is the output of awk '{print $0}' filename