Have you ever thought of searching for a user account in an enormous list of SharePoint permission groups? Nightmare isn’t it?
I bumped into this amazing utility which lists the SharePoint groups for a user account in a SharePoint site collection. Thanks to the black knight!
Run it off a command line from any client computer and you do not absolutely need to be on a server.
Parameters:
ListUsersGroups
Site-url: Url of site collection including protocol (example http://localhost)
username: Full username including domain (example MOSSWORK\user)