#!/bin/sh
# let works with + - * / % plus many other C operators
# Note that there are no spaces on either the left or right side
# of +, - , *, / , %, unless you quote the expression.
# let SUM=1 + 2 (this is wrong)
let "SUM = 1 + 2" # Okay, since quoted the spaces
let SUM=1+2 # okay, no spaces, no need for quotes
let SUB=5-1
let MUL=2*5
let DIV=10/3
let REMAINDER=10%3
let 'EQUATION = 1 + 2 - 5 * 4 / 10'
echo "SUM is ${SUM}"
echo "SUB is ${SUB}"
echo "MUL is ${MUL}"
echo "DIV is ${DIV}"
echo "REMAINDER is ${REMAINDER}"
echo "EQUATION is ${EQUATION}"