Hi,
I need to concatenate three files in to one destination file.In this if some duplicate data occurs it should be deleted.
eg:
file1:
data1 value1
data2 value2
data3 value3
file2:
data1 value1
data4 value4
data5 value5
file3:
data1 value1
data4 value4
data3 value3
data6 value6
the result file:
data1 value1
data2 value2
data3 value3
data4 value4
data5 value5
data6 value6
How to achieve this?