Adding 2 numbers

Viper01 · #1 (**permalink**) 04-15-2004

I would like to write a script with BASH to add two numbers (integer) and write the result to the standard output. Please help!

google · #2 (**permalink**) 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)'

jim mcnamara · #3 (**permalink**) 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

home_king · #4 (**permalink**) 04-16-2004

expr $var1 + $var2

butterfm · #5 (**permalink**) 04-16-2004

There are loads of ways to do it.

Another is

echo "1 + 2" | bc

Matt

Viper01 · #6 (**permalink**) 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!

home_king · #7 (**permalink**) 04-17-2004

Just try Gawk!
It performs in superior to other awk's clones.

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