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@scrutinizer, thanks it really worked, could you please help me with the same case, if i have to find the duplicate rows in a csv if column 2 of csv is not equal, like if

a,1,2
a,3,2
b,2,4
...

How can i get the duplicates rows from a file using unix, for example i have data like


a,1
b,2
c,3
d,4
a,1
c,3
e,5


i want output to be like


a,1
c,3