matrix - quickest way in R to check that all columns are identical -

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Assume that I have a matrix with 3 columns 

  10 10 10 8 8 8 9 9 7 7 7 5 5 4 4 3 3 3 6 6 6 2 2 2 1 1 1   
 What would be the fastest way to check that all the columns are the same? I can do something like  all  or  identical  to check any two and then keep on moving with the next set, but is there anything more clever?  
 Ideally, I would like a solution that is independent of the number of columns.   
 
 
 You can try:  data  
  m1 < - Matrix (c (10: 1, 10: 1, 10: 1), nucleus = 3) M2 and lieutenant - cbind (m1, 11: 2)

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