[R] removing lines from text file

[Doug Edmunds]

I downloaded a text file which has several lines of text before the 
header line of the data, similar to this:

---start---
"Corn December 2012 (CZ2012)"
Source:  Wikiposit Open Data via wikiposit.org 
(http://wikiposit.org/uid?FUTURE.CZ2012)
Update: 
http://wikiposit.org/w?action=dl&dltypes=comma%20separated&sp=daily&uid=FUTURE.CZ2012

Date,Open,High,Low,Settle,Volume,OpenInt,
08-Jun-2009,0,469.5,469.5,469.5,0,0,
09-Jun-2009,0,476.75,469.5,476.75,0,0,
...

After I download the file using R, how do I remove the lines of text
that appear before the header line (Date, Open, ...)?