R CMD INSTALL invalid package

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1

I'm having yet another stupid day:

on ubuntu 20.04 bash shell:

sudo R CMD INSTALL shiny
[sudo] password for dutky: 
Warning: invalid package ‘shiny’
Error: ERROR: no packages specified

succeeds using install.packages("shiny") in R session. Same happens with all packages so far

2

With R CMD INSTALL you have to supply a local directory or tar file, not a CRAN package:

$ R CMD INSTALL --help
Usage: R CMD INSTALL [options] pkgs

Install the add-on packages specified by pkgs.  The elements of pkgs can
be relative or absolute paths to directories with the package
sources, or to gzipped package 'tar' archives. 
[...]

On the CLI you can use also

Rscript -e "install.packages('shiny')"
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