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Hello Sudha Appireddy
Are you trying to refresh the extract for Tableau Server on a desktop pc? If so, you could do something like this:
tableau refreshextract --datasource "DATASOURCE" -c Config.txt
the Config.txt would contain the user name, password and server info for Tableau Server.
This is outlined here: Tableau Data Extract Command-Line Utility
The part about checking to see if a file exists will take some research with command line dos commands - here is a stackoverflow thread on the topic though:
I hope this helps
Trying to refresh extract for Tableau Server!