Code:
join -o 1.2 0 2.2 -1 1 -2 1 file1 file1 | nawk '!a[$3$2$1];{a[$1$2$3]++}'
This may perform better (or not) with a large file1:
Code:
join -o 1.2 0 2.2 -1 1 -2 1 file1 file1 | nawk '$1<$3{print;next}{print$3,$2,$1}' | sort -u
Last edited by colemar; 05-26-2009 at 11:11 AM..
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