[R] test for end of file?

[Fitzpatrick, Denis F]

I want to read in text files, processing a line at a time in a while loop,
and exiting the loop when the entire file has been read.  The files are too
large to suck in as a piece.
\
for example in :

while (line.I.just.read.in != end.of.file){
	dostuff()
	}

what is end.of.file? 
or what would be the functional alternative to this little snippet?

thanks

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