run shiny app or rmarkdown shiny doc from cmd command

hello everybody,
I know there are many solved questions about this but nothing works for me and I don't under stand <hy
please help I 'm desperate
I followed these exact steps one by one to run shiny app
(http://rstudio-pubs-static.s3.amazonaws.com/3269_a6682dfda37e411fb5e0e6699495cdc4.html) ,
but when I run the BAT file nothing happens
Please Please help
Thank you in advance