Math operator in a Shell Script

Operators

The shells use arithmetic operators from the C programming language, in decreasing order of precedence.Math Operators

OPERATOR	DESCRIPTION
++ −− < /editor query >	Auto-increment and auto-decrement, both prefix and postfix
+	Unary plus
−	Unary minus
! ~	Logical negation; binary inversion (one's complement)
* / %	Multiplication; division; modulus (remainder)
+ −	Addition; subtraction
<< >>	Bitwise left shift; bitwise right shift
<= >=	Less than or equal to; greater than or equal to
< >	Less than; greater than
== !=	Equality; inequality (both evaluated left to right)
&	Bitwise AND
^	Bitwise exclusive OR
|	Bitwise OR
&&	Logical AND
||	Logical OR