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NR==FNR confusions

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linux-howto

http://www.unix.com – This has been asked and answered hundreds of times, but I can't understand the syntax of awk's NR==FNR trick for merging files and printing the correct columns. Here's my File 1 Code:   1  rs8179466    224176    A        ADD    1037      1.066  0.1421  0.8065    1.408      0.4468        0.655   1  rs3094315    742429    G        ADD    1103    0.8797  0.1553  0.6488& (HowTos)