#!/bin/bash
a=2
b=3
c=a+b
d=$((a+b))
e=$a*$b
f=$[a*b]
let g=a+b
h=`expr $a + $b`

echo "a="$a
echo "b="$b
echo "c="$c
echo "d="$d
echo "e="$e
echo "f="$f
echo "g="$g
echo "h="$h

let b+=1
echo "b="$b

let b++
echo "b="$b

let a-=1
echo "a="$a


