How to quit R script & return to R prompt

Hi 
can you please tell me how to quit R script & return to R prompt.
As i tried following but still cannot able to return on to R prompt..

R> barplot(Forbes2000$profits)
R> barplot(xtab(`profits,data=Forbes2000))
+ barplot(xtab(~profits,data=Forbes2000))
+ )
+ Q()
+ ?barplots
+ 
+ 
+ 
+ 
+ barplot?
+ ?
+ ??
+ ????
+ stop()
+ exit()
+ 
+ 
+ ctrl+c
+ q()
+ 
I'm beginner in R & trying to learn....

Thanks & Regards

Amitesh



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