| Sys.getenv {base} | R Documentation |
Sys.getenv obtains the values of the environment variables.
Sys.getenv(x = NULL, unset = "")
x |
a character vector, or NULL. |
unset |
a character string. |
Both arguments will be coerced to character if necessary.
Setting unset = NA will enable unset variables and those set to
the value "" to be distinguished, if the OS does.
A vector of the same length as x, with the variable names as
its names attribute. Each element holds the value of the
environment variable named by the corresponding component of 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 = which some
platforms allow but POSIX does not.
Sys.setenv,
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)
## Language and Locale settings -- but rather use Sys.getlocale()
s[grep("^L(C|ANG)", names(s))]