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# Unix - Shell Arithmatic Operators Example

Here is an example which uses all the arithmatic operatos:

    #!/bin/sh

    a=10
    b=20
    val=`expr $a + $b`
    echo "a + b : $val"

    val=`expr $a - $b`
    echo "a - b : $val"

    val=`expr $a \* $b`
    echo "a * b : $val"

    val=`expr $b / $a`
    echo "b / a : $val"

    val=`expr $b % $a`
    echo "b % a : $val"

    if [ $a == $b ]
    then
       echo "a is equal to b"
    fi

    if [ $a != $b ]
    then
       echo "a is not equal to b"
    fi

This would produce following result:

    a + b : 30
    a - b : -10
    a * b : 200
    b / a : 2
    b % a : 0
    a is not equal to b

There are following points to note down:

- There must be spaces between operators and expressions for example 2+2 is not correct, where as it should be written as 2 + 2.

- Complete expresssion should be enclosed between ``, called inverted commas.

- You should use \ on the * symbol for multiplication.

- if...then...fi statement is a decision making statement which has been explained in next chapter.

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