Sys.getenv obtains the values of the environment variables.
Sys.getenv(x = NULL, unset = "", names = NA)
a character vector, or
a character string.
logical: should the result be named? If
Both arguments will be coerced to character if necessary.
unset = NA will enable unset variables and those set to
"" to be distinguished, if the OS does. POSIX
requires the OS to distinguish, and all known current R platforms do.
A vector of the same length as
x, with (if
TRUE) the variable names as its
names attribute. Each element
holds the value of the environment variable named by the corresponding
x (or the value of
unset if no environment
variable with that name was found).
On most platforms
Sys.getenv() will return a named vector
giving the values of all the environment variables, sorted in the
current locale. It may be confused by names containing
some platforms allow but POSIX does not. (Windows is such a platform:
there names including
= are truncated just before the first
x is missing and
names is not false, the result is
"Dlist" in order to get a nice
Sys.getlocale for the locale in use,
getwd for the working directory.
The help for ‘environment variables’ lists many of the environment variables used by R.
## whether HOST is set will be shell-dependent e.g. Solaris' csh does not. Sys.getenv(c("R_HOME", "R_PAPERSIZE", "R_PRINTCMD", "HOST")) names(s <- Sys.getenv()) # all settings (the values could be very long) head(s, 12)# using the Dlist print() method ## Language and Locale settings -- but rather use Sys.getlocale() s[grep("^L(C|ANG)", names(s))]
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