How to write addtion program in unix [duplicate]

Question

I know it is basic question but i am unable to write simple addition program in unix. i am using cygwin to write the shell script my script is this

#!/bin/sh
echo "enter the first number"
read a
echo "enter the seconf number"
read b
echo  [$a + $b]

Eugen Rieck · Accepted Answer · 2013-10-15 18:59:19Z

1

#!/bin/sh
echo "enter the first number"
read a
echo "enter the seconf number"
read b
echo  $(($a+$b))

answered Oct 15, 2013 at 18:59

Eugen Rieck

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1 Comment

Atle · Accepted Answer · 2013-10-15 18:57:03Z

0

To add two numbers, you can do this:

let c = $a + $b
echo $c

To read, you can do:

read -p "Enter the first number" a
read -p "Enter the second number" b

answered Oct 15, 2013 at 18:57

Atle

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