Print duplicate lines

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# 1  
Old 05-19-2011
Print duplicate lines

I have a file where some of the lines are duplicates.

How do I use bash to print all the lines that have duplicates?
# 2  
Old 05-19-2011
awk 'arr[$0]++; END {for(i in arr ){ if(arr[i]>1){print i}   }   }' inputfile

# 3  
Old 05-19-2011
awk '$0==s{print s RS $0}{s=$0}' file

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