CentOS install.packages issue "user not found"

General
1

...Hello all, I am attempting to do a fresh build of a Shiny server, using CentOS 8. I have been using the instructions on the Shiny server download site.
I have been successful up to the point of installing the Shiny R packages. Using the code on the website <sudo su -
-c "R -e "install.packages('shiny', repos='https://cran.rstudio.com/')"">
I am getting the following error/response: <[root@CP-Shiny]# sudo su - \ -c "R -e "install.packages('shiny', repos='https://cran.rstudio.com/')""
su: user -c does not exist>

I have been unable to find a work around for this, any help will be extremely appreciated.

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