Windows PowerShell Programming, Scripting, Error Handling, and Debugging - Professional SQL Server 2008 Administration with Windows PowerShell - page 50

Operators
Any programming language generally supports numeric operators similar to mathematical operators.
In addition to the numeric operators, PowerShell also supports other operators. The following tables
describe the operators available in PowerShell.

Numeric Assignment
Operator

Description

= Assigns a value to a variable

+= Adds the value of the right side of the assignment to the existing value

of the left side and assigns the result to the variable on the left side

−= Subtracts the value of the right side of the assignment from the existing

value of the left side and assigns the result to the variable on the left
side

* = Multiplies the value of the right side of the assignment and the existing

value of the left side and assigns the result to the variable on the left
side

/ = Divides the value of the left side of the assignment into the existing

value of the right side and assigns the result to the variable on the left
side

% = Divides the value of the left side of the assignment into the existing

value of the right side and assigns the remainder to the variable on the
left side

Logical Operator Description

-and Is true if both comparisons are true and only then

-or Is true if one or both comparisons is true

-not Negation

! Negation. Synonym for -not .

Unary Operator Description

Signifies explicitly that a number is a positive number

+

Signifies that a number is a negative number

−

Increments a value or variable

++

Decrements a value or variable

−