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NR=FNR

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# 8  
Old 06-06-2012
First we need to record field 1 in the NR==FNR part, which is done correctly, even though the assigment of $1 is superfluous and it could be written as:
Code:
{A[$1]; next}

Then in the second part field 1 needs to be printed but only if field 2 is an entry in array A, so this condition still needs to be added to the second part...
This User Gave Thanks to Scrutinizer For This Post:
ddreggors
# 9  
Old 06-06-2012
Thanks again Scrutinizer!

Code:
awk 'NR==FNR {A[$1];next} {if ($2 in A) print $1}' file2 file1 
1
3

This User Gave Thanks to ddreggors For This Post:
shaan4uster
# 10  
Old 06-07-2012
MySQL Thanks a lot
It is working as expected.
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