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R_LIBS Directives

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R_LIBS_USER
- Intended to list libraries for a user, which doesn't affect other users.
- Environment variable which is read at start-up.
- You can socify multiple libraries
- R_LIBS_USER=/R/R-libs/3.4h:/R/R_libs/3.5
R_LIBS_SITE
- Intended to list libraries shared by multiple users at a site (e.g., the same computer).
- Environment variable which is read at start-up.
- This generally should be packages installed in R_HOME.
- For example
- R_LIBS_SITE=/usr/lib/R/site-library:/usr/lib/R/library
.libPaths()
- Shows libraries in the search path or adds them.
- Executed in an R session.
- This would also work for you.
R_LIBS :
- Environment variable which is read at start-up.
- The is the location in which R installs packages

Both R_LIBS_USER and R_LIBS_SITE can specify multiple library paths, separated by colons (semicolons on Windows).

The value of R_LIBS is your provate R packages directory. You can put it in a file named .REnviron in your home HOME directory and use it as your private tree of installed libraries

R_LIBS=c:/R/mylibraries

From then on, you should be able to install packages into that location automatically, without having to fiddle around with .libPaths.

After setting this, install.packages() saves packages in the directory specified by R_LIBS. The location of this directory can be referred back to subsequently as follows:

Sys.getenv("R_LIBS")

All currently stored environment variables can be seen by calling Sys.getenv() with no arguments.

Note that many environment variables are already preset and do not need to be specified in .Renviron.

HOME, for example, which can be seen with Sys.getenv("HOME"), is taken from the operating system’s list of environment variables.

A list of the most important environment variables that can affect R’s behavior is documented in the help page help("environment variables").

To set or unset an environment variable for the duration of a session, use the following commands:

Sys.setenv("TEST" = "test-string") # set an environment variable for the session
Sys.unsetenv("TEST") # unset it