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Subtracting each row from the first row in a single column file using awk

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# 1  
Subtracting each row from the first row in a single column file using awk

Hi Friends,

I have a single column data like below.

I need the output like below.

where each row (including first row) subtracting from first row and the result should print below like the way shown in output file.


Last edited by Scrutinizer; 04-04-2012 at 02:13 PM.. Reason: Code tags!
# 2  
That would do the trick .
awk '$1--{print}' sample_file

# 3  
You want row 2 (etc) subtracted from row 1, or row 1 subtracted from row 2?
# 4  
I want row1 need to be subtracted from all rows including row itself.

I need the following operation to be done.
So on..
The script "awk '$1--{print}'" is not giving correct output.
For the input of

I got the output as

which is not correct..
Can you please modify the script to match requirement.


Last edited by Scrutinizer; 04-04-2012 at 02:39 PM.. Reason: Code tags
# 5  
awk 'NR==1{v=$1}{$1-=v}1' infile

# 6  
My sample can be anything..

But What I need is

so on
in the output file.( whatever may be the input numeric data single column file)

# 7  
awk 'FNR==1 {p=$1} {print $1-p}' file

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