Sys.unsetenv removes environment variables.
- named arguments with values coercible to a character string.
- a character vector, or an object coercible to character.
Non-standard R names must be quoted in
Sys.setenv: see the examples. Most platforms (and POSIX) do not allow names containing
"=". Windows does, but the facilities provided by R may not handle these correctly so they should be avoided. Most platforms allow setting an environment variable to
"", but Windows does not, and there
Sys.setenv(FOO = "") unsets FOO.
There may be system-specific limits on the maximum length of the values of individual environment variables or of all environment variables.
A logical vector, with elements being true if (un)setting the corresponding variable succeeded. (For
Sys.unsetenv this includes attempting to remove a non-existent variable.)
Sys.getenv, Startup for ways to set environment variables for the R session.
setwd for the working directory.
The help for ‘environment variables’ lists many of the environment variables used by R.
Documentation reproduced from R 3.0.1. License: GPL-2.