Using opendata set to output a file

Hi,
I have a query in using open dataset command.
let us consider this scenario as an example.
I need to select 5 fields from mara table and I want to display the output in a flat file.Later, I have to read the data from the flat file and to display the output in sap screen.
Can someone help me on doing this and also if you send me the code , it will be useful for me to understand.
Thanks,
Stal.

Hi Stalin,
Download data to a unix file :
1) Declare parameter p_file LIKE rlgrap-filename OBLIGATORY.
(convert logical file to physical file using FM file_get_name)
2) Declare internal table and work area
3) OPEN DATASET <dsn> FOR OUTPUT
4) Retrieve data and store in internal table
5) For each record use statemet Transfer <f> to <dsn>
Upload data from unix file :
1) OPEN DATASET <dsn> FOR INPUT IN TEXT MODE.
2) Within statement Do... Enddo use READ DATASET <dsn> INTO internal table
3) Using internal table display the data in screen
With Regards,
Gandhi Subramani

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