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awk compare column between 2 files


 
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# 1  
Old 01-18-2008
awk compare column between 2 files

Hi, I would like to compare file1 and file2

file1

1
2
3

file2

1 a
2 b
3 c
4 d

The result should only print out "d" in file 2.

Thanks
# 2  
Old 01-18-2008
One quick approch:

Code:
grep -v "$(cat file1)" file2 | awk '{print $2}'

This User Gave Thanks to dennis.jacob For This Post:
# 3  
Old 01-18-2008
Oops, I found a thread posted by Ygor

awk -F " " 'BEGIN{while(getline<"file1") a [$1]=1 } ; a [$1] !=1 {print $2 } ' file2

This command works great.
This User Gave Thanks to phamp008 For This Post:
# 4  
Old 01-18-2008
Thank you Jacoden. Your command works fine too.

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