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Please have a look at GitHub - RallyTools/Rally-User-Management
This user management tool comes (besides others) with the script user_permissions_summary_selected.rb which
"Summarize user permissions for a select list of users specified by an input CSV file"
See the Readme.pdf or readme.docx on the above link for more information on how to configure and use the tool.
NOTE: The Rally User Management toolkit is available on an as-is basis and is neither supported nor maintained by CA