Search notes:

/etc/R/Renviron

The purpose of the Renviron file is to set environment variables.
It might contain something like 
LC_COLLATE  = "English_United States.1252"
LC_CTYPE    = "English_United States.1252"
LC_MONETARY = "English_United States.1252"
LC_NUMERIC  = "English_United States.1252"
LC_TIME     = "English_United States.1252"
In an R session, it can be edited or created using file.edit(): 
renv = path.expand(file.path('~', '.Renviron'));
file.edit(renv);

See also

The R function sessionInfo
R files

Index

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