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AvoidExclaimOperator.md

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description Avoid exclaim operator
ms.date 07/21/2026
ms.topic reference
title AvoidExclaimOperator

AvoidExclaimOperator

Severity Level: Warning

Default state: Disabled

Description

This rule detects the use of the negation operator (an exclamation mark, !) and recommends using the -not operator instead for improved readability and consistency with PowerShell conventions.

The -not operator is more explicit and aligns with PowerShell's verbose style, making code easier to understand at a glance.

Example

Noncompliant

$MyVar = !$true

Compliant

$MyVar = -not $true

Configure rule

Rules = @{
    PSAvoidExclaimOperator  = @{
        Enable = $true
    }
}

Parameters

Enable

This parameter controls whether ScriptAnalyzer checks the code against this rule. It accepts a boolean value. To enable this rule, set this parameter to $true. The default value is $false.