R: Environment variables

with_envvar {withr} | R Documentation

## Environment variables

### Description

Temporarily change system environment variables.

### Usage

    with_envvar(new, code, action = "replace")

### Arguments

`new` | `[named character]` New environment variables
`code` | `[any]` Code to execute in the temporary environment
`action` | should new values `"replace"`, `"prefix"` or `"suffix"` existing variables with the same name.

### Details

if `NA` is used those environment variables will be unset. If there are any duplicated variable names only the last one is used.

### Value

`[any]`
The results of the evaluation of the `code` argument.

### See Also

`withr` for examples

`Sys.setenv`

[Package withr version 1.0.2 Index]