How to input EOF in stdin in R?

I'm new to R, I wonder how to input EOF in stdin f开发者_C百科or R ? For example, the function readLines() reads input lines from stdin, but how can tell it to stop ?

A rookie problem, and thanks for you attention.

PS. Problem solved. But I still cannot input EOF in the StatET (R plugin for eclipse). Any one has any solution ?

The input is handled by the readline library common to other GNU project programs, and it commonly receives EOF when you press Ctrl-D.

Here is an example using littler (and I am not sure why every inout gets echoed back):

$ r -e 'print(summary(as.integer(readLines())))'
1
1
2
2
3
3
4
4
8
8                                                    ## I pressed Ctrl-D here
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
    1.0     2.0     3.0     3.6     4.0     8.0 
$