unix - Replace repeating variables by "NA" using awk -


suppose have next file:

1 blue 2 red 3 yellow 4 yellow 5 yellow 6 purple 7 purple 8 green

and following file, replacing repeated variables "na"

1 blue 2 red 3 yellow 4 na 5 na 6 purple 7 na 8 green

try - 

$ awk 'a[$2]++{$2="na"} 1' f 1 blue 2 red 3 yellow 4 na 5 na 6 purple 7 na 8 green

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