Adding two numbers using expr

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http://unix.stackexchange.com – I'm learning Shell scripting for a diploma in IT I'm currently doing. I'm trying to write a small script that adds two numbers as shown as in one of the tutorials we were given. echo "Enter two numbers" read num1 num2 sum = 'expr $num1 + $num2' echo "The sum is = $sum" However when I give it the execution permission and run the script, it gives me this error. sum: =. No such file or directory. sum: expr $num1 + $num2: No such file or directory I tried running this on both Ubuntu and Fedora but same error occurs. Can anyone please tell me what I'm missing here? (HowTos)