Sys.getenv | R Documentation |
Sys.getenv
obtains the values of the environment variables.
Sys.getenv(x = NULL, unset = "", names = NA)
x |
a character vector, or |
unset |
a character string. |
names |
logical: should the result be named? If |
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. POSIX
requires the OS to distinguish, and all known current R platforms do.
A vector of the same length as x
, with (if names ==
TRUE
) 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. (Windows is such a platform:
there names including =
are truncated just before the first
=
.)
When x
is missing and names
is not false, the result is
of class "Dlist"
in order to get a nice
print
method.
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) 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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