Is there any other way I can achieve with awk or unix one liner commands?

Well, 

perl -lane 'print $F[6] if ! $seen{ $F[6] }++' file.txt

[download]
is sort of a Unix one-liner, isn't it?  ;-)

In reply to Re^3: OT: Find unique values in a column by Laurent_R
in thread OT: Find unique values in a column by rahulme81

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