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Shell Programming and Scripting

Adding 2 numbers

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# 1  
Old 04-15-2004
Data Adding 2 numbers
I would like to write a script with BASH to add two numbers (integer) and write the result to the standard output. Please help!
# 2  
Old 04-15-2004
use the bc command or use awk.
assuming two numbers in a file called file1

cat file1 | awk ' printf("%d\n", $1 + $2)'
# 3  
Old 04-15-2004
this short script works in sh & ksh, I assume bash as well.

Code:
let i=0
let i=$1+$2
echo $i

# 4  
Old 04-16-2004
expr $var1 + $var2
# 5  
Old 04-16-2004
There are loads of ways to do it.

Another is

echo "1 + 2" | bc

Matt
# 6  
Old 04-17-2004
First of all, thank you very much for help, but I still have problems:

- I have to write my script without bc or dc commands.

- I would like to sum very-very big numers (600 characters long).
It doesn't work with let, expr, or awk. (because of overflow)

Have you got any idea, how to solve this problem?

Thank you!
# 7  
Old 04-17-2004
Just try Gawk!
It performs in superior to other awk's clones.
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