Comments on: Unix scripts: how to sum numbers up

By: Emil

Emil — Tue, 21 Dec 2010 18:10:55 +0000

Hello I'm trying to sum a field in a | delimited file but not receiving the correct value. Not sure how I'm getting e+06. Please help cat file.TXT |awk 'FS = "|" { sum += $12 } END { print sum }'|xargs -n1|while read sum ;do aa='$'$sum ;done echo $aa 7.60411e+06 Thank you

By: jeff

jeff — Sun, 12 Dec 2010 17:49:43 +0000

Neeraj Batra, you would need double quotes instead of single quotes to allow the shell to interpret the variables.

By: Neeraj Batra

Neeraj Batra — Mon, 08 Nov 2010 07:42:02 +0000

Hi Pete

Thanks for your response, But the problem is that in below example

echo 'scale=25;57/43′ | bc

Values 57 and 43 are in variables in my script

i.e.

a=57
b=43
echo 'scale=25;$a/$b′ | bc

Above does not work

Plz help

Rgds
Neeraj Batra

By: jeff

jeff — Wed, 24 Mar 2010 17:20:27 +0000

You can make your code tighter in ksh and bash:

SUM+=$NUM

instead of

SUM=$(($SUM + $NUM))

Also, you can use an awk one-liner instead of a while loop:

for i in 1 2 3 4 5; do echo $i; done | awk '{s+=$1} END {print s}'

cat | awk '{s+=$1} END {print s}'
1
2
3
4
5
^d
15 (result)

By: Pete

Pete — Wed, 05 Aug 2009 19:13:20 +0000

Hello Ankan,
you need to use "scale" option from bc:
echo 'scale=25;57/43' | bc

Scale controls the number of decimal points. Not sure if scale is an option, command or what not… but that's your answer.

Regards,
Pete

By: Floating point calculations in Unix scripts — UNIX Tutorial: Learn UNIX

Floating point calculations in Unix scripts — UNIX Tutorial: Learn UNIX — Thu, 18 Jun 2009 12:12:10 +0000

[...] Summing numbers up in Unix scripts [...]

By: Ankan

Ankan — Mon, 15 Jun 2009 13:35:51 +0000

Hello,

Can you please provide the following codes:

1. I divide 20 /6 . The answer id now 3. It sould be 3.33
2. How to do 10.222 + 1.1 = 11.322

Thanks in advance.