1. The problem statement, all variables and given/known data:
So I have to write a Bourne script that will add two numbers, taking only two arguments and informs the user when it is used incorrectly.

2. Relevant commands, code, scripts, algorithms:

It has to be done in sh. I think overall, it is a pretty basic script.

3. The attempts at a solution (include all code and scripts):

#!/bin/sh

addnumbers()
{ if [$3 = ""]; then
sum = 'expr $1 + $2'
echo $sum
else
echo "Please only enter two arguments."
fi
}

done

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
University of Notre Dame, IN, US, Freeland, CSE30189 Basic Unix for Engineers


What I am having trouble with is testing it out. From what I understand, I should have the file in my directory, chmod to like 755 or something, then just type in the name of the file. However, I was wondering how I could pass arguments into it to actually run it through the function. Also, I was unsure as to how I could make sure it was only two values, so I just made it so that if $3 was anything other than blank, it would just exit it.

Thanks for any advice you guys can give!