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Match two files and divide a field !

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# 1  
Old 06-19-2010
Question Match two files and divide a field !
Hello,

I have two files that have the date field as a common. I request your help with some script that divide the value of the file1 by the value in the file2 only when the field date are the same between both files and create a new text file.

This is a sample of the files

file1
Code:
6/1/2010,    107.02
6/3/2010,    110.19
6/4/2010,    106.31
6/7/2010,    104.99
6/8/2010,    106.12
6/9/2010,    105.55
6/11/2010,    109.16
6/14/2010,    108.99
6/15/2010,    111.47
6/16/2010,    111.43
6/17/2010,    111.61
6/18/2010,    111.73

file2
Code:
6/1/2010,    19.91
6/2/2010,    19.78
6/3/2010,    17.96
6/4/2010,    19.19
6/8/2010,    21
6/9/2010,    20.56
6/10/2010,    18.97
6/11/2010,    20.01
6/15/2010,    20.99
6/16/2010,    20.33
6/17/2010,    21.9
6/18/2010,    22.83

Thanks in advance
Last edited by Scott; 06-20-2010 at 08:15 AM..
# 2  
Old 06-19-2010
Hi

Code:
awk 'NR==FNR{a[$1]=$2;next;}{if ($1 in a) print $1, $2/a[$1];else print;}' file2 file1

For those dates in file1 which does not have a matching date in file2, the above will print the line in file1 as is. If that is not desired, remove the 'else print' part in the above.

To put the output in a new file, redirect the output of the above to a new file.

Guru.
This User Gave Thanks to guruprasadpr For This Post:
csierra
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