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Shell Programming and Scripting

Difference between two columns and count

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# 1  
Old 04-25-2011
Difference between two columns and count
hi I am very new to shell scripting. i wanted to achieve this..

 
Col1 Col2 Col3 Col4
aa 23 bb 32
aa 34 bb 12
aa 45 bb 345
kk 20 ss 50
kk 30 ss 50
tt 10 vv 50

Desired output is

 
Col1 Col2 Col3 Col4 Difference Count
aa 23 bb 30 7 2
aa 34 bb 14 -20 2
aa 45 bb 345 300 2
kk 20 ss 50 30 2
kk 30 ss 50 20 2
tt 10 vv 50 40 1

The difference column is [Col4 - col2] and Count column should only count number of rows if the value is between -50 and 50. I had one code but it is breaking in between and taking many hours to run..

Thanks for the help!!!
Last edited by empyrean; 04-25-2011 at 12:24 AM..
# 2  
Old 04-25-2011
I am trying and could do till adding difference column and i need to count them now. This is what i used to do

Quote:
awk '{a=$4;b=$2} {if(a-b<=50 && a-b>-50) print $0,a-b }' tablename
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