# useRepos

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##### Sets package repositories

Sets package repositories.

Keywords
programming, IO
##### Usage
useRepos(repos=NULL, where=c("before", "after", "replace"), unique=TRUE, fallback=TRUE,
...)
##### Arguments
repos

A character vector of repositories to use. If NULL, nothing is replaced.

where

A character string specifying how to add them to the current set of repositories.

unique

If TRUE, only unique repositories are set.

fallback

If TRUE, any remaining non-specified repository value of format '...@' (e.g. '@CRAN@') than could not be recovered by other means, will be assigned to a pre-defined known value, if possible. If so, then an informative warning is given.

...

Not used.

##### Value

Returns a list with element 'repos' reflecting options("repos") as the options where prior to calling this function.

withRepos().