[Rd] OS calls

[Paul Gilbert]

P.S.
>> sleep <- function(n) {system.call(paste("sleep ", n))} # pause for n seconds

>That's on my TODO list (but allowing sub-sec accuracy). KH suggested that
>we hide names like that behind a .Sys call (but then he introduced getwd).
>There is already at least one object called sleep (a dataset) in an R
>package.

Changing these names is fine with me.

Paul

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