su: ignoring --preserve-environment, it's mutually exclusive with --login

Listening on http://127.0.0.1:34215
Warning: Error in cat: argument 2 (type 'list') cannot be handled by 'cat'
  118: cat
  117: renderPrint [/srv/shiny-server/hello/server.R#35]
  116: func
  100: renderFunc
   99: output$packageInfo
    1: runApp
Terminated