Shell Programming and Scripting

Hi Everybody,
I have an requirement in my project like I need to compare first 2 columns of two files and create a 3rd file in the format col1 col2 Y/N(Indicating matched or not)

Ex:
File 1:
Col1 Col2
Col3 col 4
File 2:
col1 col2
col5 col6
File 3:
col1 col2 Y
col3 col4 N
col5 col6 N

Thanks in advance

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