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If col1 and col2 of any line in both of two files in two files match, col1 and col2

 
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# 1  
Old 03-03-2013
If col1 and col2 of any line in both of two files in two files match, col1 and col2
I have two files, and I'm interested in the first two columns of each.

File1 compares set1 to set2 (column1 = set1 name, column2 = set2 name).
File2 compares set2 to set1 (column1 = set2 name, column2 =set1 name).

I want to print the set names (column values) that appear as pairs in both files.

File1
Quote:
ACYPI070094-PA_product:Pol m.174988_g.174988 84.7 28 254 11 61 72 72 -1
ACYPI46488-PA_product:GLE m.160140_g.160140 69.6 45 231 26 78 112 104 -1
ACYPI007564-PA_product:unc m.118328_g.118328 96.2 100 79 3 76 79 79 -1
ACYPI38332-PA_product:GLEA m.1442_g.1442 80.4 100 148 29 119 148 161 -1
File2
Quote:
m.180547_g.180547 ACYPI56734-PA_product:dyn 89.9 100 69 7 62 69 873 -1
m.180550_g.180550 ACYPI007994-PA_product:3-k 69.2 100 78 24 54 78 397 -1
m.180565_g.180565 ACYPI008535-PA_product:Sar 81.2 100 80 15 65 80 1023 -1
m.160140_g.160140 ACYPI46488-PA_product:GLE 75.4 81 169 33 104 138 305 -1
Output
Quote:
m.160140_g.160140 ACYPI46488-PA_product:GLE
Can anyone help me out with this? I don't know where to go after recognizing and sorting columns.
# 2  
Old 03-03-2013
Code:
$ awk ' NR == FNR { arr[$1$2]=1; next } arr[$2$1] {print $1, $2} ' file1 file2
m.160140_g.160140 ACYPI46488-PA_product:GLE

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