I have two text files that each have two space separated columns .

File 1:

Mary 123
Jack 836
Joan 936

File 2:

Mary 123
Jack 837
Henry 430

What I'm looking for is to find names unique to both files as well as names common to both files but with a different value .

Output

• Jack: Common to both files but different value (836,837)
• Joan: Unique to File1
• Henry: Unique to File2

How do I do this using unix commands?

One thing I came across is to use comm command to find unique names and then use the diff command to find common names with different values. But is there a more efficient way to do this ?

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