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Show difference between two number

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# 1  
Old 11-24-2013
Show difference between two number
Hi,

I would like to show the difference between two numbers. For example.

input.txt
Code:
1 7
2 10
0 0
6 7

I would like a third field showing the difference between the numbers as below:

ouput.txt
Code:
1 7 6
2 10 8
0 0 0
6 7 1

How do I do this?

Thanks,
# 2  
Old 11-24-2013
Is this homework?

What have you tried so far?

Which OS; shell, machine etc...
This User Gave Thanks to wisecracker For This Post:
Scott
# 3  
Old 11-24-2013
Code:
cat inputfile | while read a b
do
c=`expr $a - $b`
echo $a $b $c
done

This User Gave Thanks to Amit_1981 For This Post:
general_lee
# 4  
Old 11-24-2013
Using Contos 6.4, bash shell on VM.

Amit, this works thanks.
# 5  
Old 11-24-2013
Try :

Code:
$ awk '{print $0,$2-$1}' file

Code:
$ awk '$0 = $0 FS $2-$1' file

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