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Error with Expression

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# 1  
Old 06-11-2010
Error with Expression
Hi All,

am trying to add two Inputs i.e., $1 and $2,

Code
Code:
#!/bin/sh
$num_sum=`expr $1+$2`
echo "Sum = $num_sum"

am giving statement
Code:
sh arithemetic.sh 20 10

am getting error

Code:
arithemetic.sh: line 2: =20+10: command not found
Sum =

I want Output as

Code:
Sum = 30,

Can any one please help me in this,

Thanks,
Sunil N
Last edited by pludi; 06-11-2010 at 04:59 AM.. Reason: code tags, please...
# 2  
Old 06-11-2010
Code:
$num_sum=`expr $1+$2`

You don't need a $ in front of variable when assigning data to a variable.
# 3  
Old 06-11-2010
Thanks, but am getting output as Sum = 20 + 10,

How to resolve this,

I have given all the below three, but in Vain,

Code:
$num_sum=`expr $1 + $2'
$num_sum="expr $1 + $2"
$num_sum='expr $1 + $2'

Thanks,
Last edited by pludi; 06-11-2010 at 04:59 AM.. Reason: code tags, please...
# 4  
Old 06-11-2010
How about ...

Code:
sum=$(($1+$2))

# 5  
Old 06-11-2010
Yes that's working, how to make it work by using expr, can you please let me know,

Thanks,
# 6  
Old 06-11-2010
Code:
sum=$( expr $1 + $2 )

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