join with more keys and many files

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Stefanie
Stefanie 2013-2-13
I am looking for an easy way to join more than 2 datasets with several keys: my datasets have the colums: x, y, Par.
The datasets should be joined by the keys x and y
So the final dataset should have the columns: x y Par1 Par2 Par3...
Can I avoid to create an additional column xy where I combine x and y? Can I join more than two files in one step or at least avoid a for- or while-loop?

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