5.4 Priority of conditional and arithmetic operations

Priority applies to the following operators that can be used in the let command:

• Numeric value comparisons

• Logical operators

• Ternary operator

• Arithmetic operations

The table below shows the priority of conditional expressions and arithmetic operations in descending order of priority level, where 1 is the highest priority. Operations are performed in descending order of the priority, starting from the highest.

Table 5‒30: Priority of operators

Priority	Operator
1	- (unary minus operator), !, ++, --, ~
2	**
3	*, /, %
4	+, -
5	<<, >>
6	<, <=, >, >=
7	==, !=
8	&
9	^
10	|
11	&&
12	||
13	?: (ternary operator)
14	=, +=, -=, *=, /=, %=, &=, ^=, |=, <<=, >>=

In the example shown below, 3**3 is calculated first because ** has a higher priority than *. As a result, the value 54 is assigned to a and 54 is output to the standard output.

let a=2*3**3   <-- 3 to the power of 3 is multiplied by 2
echo $a        <-- 54 is output as the value of a to the standard output

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