Mate.Driver.exec

You're seeing just the callback exec, go back to Mate.Driver module for more information.
Link to this callback

exec(session, command, args)

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Specs

exec(session :: Mate.Session.t(), command :: String.t(), args :: [String.t()]) ::
  {:ok, String.t()} | {:error, String.t()}

Executes a command using the driver