Where are located the packages and who is the owner

I have done a function list.packages() in my package HelpersMG.

 .libPaths() returns the list of locations for packages... but who is where ?:

structure(lapply(.libPaths(), FUN = function(path) {list.dirs(path=path, full.names = FALSE, recursive = FALSE)}), .Names=.libPaths())

To get the owner for each location:

structure(as.list(system(paste("ls -ld ", .libPaths()," | awk '{print $3}'", collapse=";"), intern=TRUE)), .Names=.libPaths())

It works both in ubuntu and MacOSx. I don't have Windows computer to do the same.

 The path used by .libPaths() are defined in one of the files used for R configuration at startup:
in ubuntu: /usr/lib/R/etc/Renviron
in MacosX: /Library/Frameworks/R.framework/Resources/etc/Renviron
> file.path(Sys.getenv("R_HOME"), "etc", "Renviron")
[1] "/Library/Frameworks/R.framework/Resources/etc/Renviron"
and 
~/.Renviron
~/.Rprofile

The files /usr/lib/R/etc/Renviron and ~/.Renviron are read in shell and ~/.Rprofile is a R file.
sudo must be used to modify the /usr/lib/R/etc/Renviron file.

 In the file /usr/lib/R/etc/Renviron, you can find these lines (or similar):
R_LIBS_USER=${R_LIBS_USER-'~/R/x86_64-pc-linux-gnu-library/3.4'}
#R_LIBS_USER=${R_LIBS_USER-'~/Library/R/3.4/library'}

# edd Apr 2003  Allow local install in /usr/local, also add a directory for
#               Debian packaged CRAN packages, and finally the default dir
# edd Jul 2007  Now use R_LIBS_SITE, not R_LIBS
R_LIBS_SITE=${R_LIBS_SITE-'/usr/local/lib/R/site-library:/usr/lib/R/site-library:/usr/lib/R/library'}

This is where the system variables are initially set. They can be changed in ~/.Renviron; for example:
> cat ~/.Renviron
R_LIBS_USER=""

You can read them from within R using:
> Sys.getenv(c("R_LIBS_SITE", "R_LIBS_USER"))
                                                               R_LIBS_SITE 
"/usr/local/lib/R/site-library:/usr/lib/R/site-library:/usr/lib/R/library" 
                                                               R_LIBS_USER 
                                     "~/R/x86_64-pc-linux-gnu-library/3.4" 


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