# Describes the operators that connect statements in Windows PowerShell. (about_logical_operators)

**# TOPIC**

**about_Logical_Operators**

**# SHORT DESCRIPTION**

Describes the operators that connect statements in Windows PowerShell.

**# LONG DESCRIPTION**

The Windows PowerShell logical operators connect expressions and

statements, allowing you to use a single expression to test for multiple

conditions.

For example, the following statement uses the and operator and

the or operator to connect three conditional statements. The statement is

true only when the value of $a is greater than the value of $b, and

either $a or $b is less than 20.

**(**$a -gt $b

**)**-and

**(**

**(**$a -lt 20

**)**-or

**(**$b -lt 20

**)**

**)**

Windows PowerShell supports the following logical operators.

Operator Description Example

-------- ------------------------------ ------------------------

**-and**Logical and. TRUE only when

**(**1 -eq 1

**)**-and

**(**1 -eq 2

**)**

both statements are TRUE. False

**-or**Logical or. TRUE when either

**(**1 -eq 1

**)**-or

**(**1 -eq 2

**)**

or both statements are TRUE. True

**-xor**Logical exclusive or. TRUE

**(**1 -eq 1

**)**-xor

**(**2 -eq 2

**)**

only when one of the statements False

is TRUE and the other is FALSE.

**-not**Logical not. Negates the -not

**(**1 -eq 1

**)**

statement that follows it. False

! Logical not. Negates the !

**(**1 -eq 1

**)**

statement that follows it. False

**(**Same as -not

**)**

Note: The previous examples also use the equal to comparison

operator

**(**-eq

**)**. For more information, see about_Comparison_Operators.

The examples also use the Boolean values of integers. The integer 0

has a value of FALSE. All other integers have a value of TRUE.

The syntax of the logical operators is as follows:

<statement>

**{**-AND | -OR | -XOR

**}**<statement>

**{**! | -NOT

**}**<statement>

Statements that use the logical operators return Boolean

**(**TRUE or FALSE

**)**

values.

The Windows PowerShell logical operators evaluate only the statements

required to determine the truth value of the statement. If the left operand

in a statement that contains the and operator is FALSE, the right operand

is not evaluated. If the left operand in a statement that contains

the or statement is TRUE, the right operand is not evaluated. As a result,

you can use these statements in the same way that you would use

the If statement.

SEE ALSO

about_Operators

Compare-Object

about_Comparison_operators

about_If

C:\Windows>powershell get-help about_methods -full

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