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I have a large text file with columns A, B, C, and D. How do I read the unique values for columns C and D and write those unique rows to a regular text file or in JSON format?

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    Please post a row so I can see the dorm of the text for process by regular expression. Oct 2 '14 at 19:54
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    As Tyler said, please show us an example of your input and desired output. Do both C and D need to be unique? Do you mean unique combinations of C+D? Would foo bar be the same as bar foo?
    – terdon
    Oct 2 '14 at 19:58
  • A B C D q a ENT123 New York b c ENT123 New York d e ENT345 New Jersy f n ENT345 New Jersy x y ENT346 New Hampshire w p ENT346 New Hampshire file looks like this and below is the expected result Oct 3 '14 at 14:07
  • C D ENT123 New York ENT345 New Jersy ENT346 New Hampshire Oct 3 '14 at 14:10
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    Edit your examples into your question: they are too hard to read as comments.
    – jasonwryan
    Oct 6 '14 at 6:58
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Try this script:

sort -k 3,5 -u yourFile.txt | awk '{output = $3; for(i=4; i<=NF; i++) output = output " " $(i); print output;}'

where option -k sets columns C and D as key, -u unique and awk prints columns C and D.

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