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
NA(the default) single-element results are not named whereas multi-element results are.
Both arguments will be coerced to character if necessary.
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
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))]
Documentation reproduced from R 3.0.1. License: GPL-2.