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Clear-Item

Modulo:
Microsoft.PowerShell.Management Module

Clears the contents of an item, but does not delete the item.

Sintassi

Path (impostazione predefinita). 

Clear-Item
    [-Path] <String[]>
    [-Force]
    [-Filter <String>]
    [-Include <String[]>]
    [-Exclude <String[]>]
    [-Credential <PSCredential>]
    [-WhatIf]
    [-Confirm]
    [<CommonParameters>]

LiteralPath 

Clear-Item
    -LiteralPath <String[]>
    [-Force]
    [-Filter <String>]
    [-Include <String[]>]
    [-Exclude <String[]>]
    [-Credential <PSCredential>]
    [-WhatIf]
    [-Confirm]
    [<CommonParameters>]

Descrizione

The Clear-Item cmdlet clears the content of an item, but it does not delete the item. For example, the Clear-Item cmdlet can delete the value of a variable, but it does not delete the variable. The value that used to represent a cleared item is defined by each PowerShell provider. This cmdlet is similar to Clear-Content, but it works on aliases and variables, instead of files.

Esempio

Example 1: Clear the value of a variable

This command clears the value of the variable named TestVar1. The variable remains and is valid, but its value is set to $null. The variable name is prefixed with Variable: to indicate the PowerShell Variable provider.

The alternate commands show that, to get the same result, you can switch to the PowerShell Variable: drive and then run the Clear-Item command.

Clear-Item Variable:TestVar1

Set-Location Variable:
PS Variable:\> Clear-Item TestVar1

Example 2: Clear all registry entries

This command clears all registry entries in the "MyKey" subkey, but only after prompting you to confirm your intent. It does not delete the "MyKey" subkey or affect any other registry keys or entries. You can use the Include and Exclude parameters to identify particular registry keys, but you cannot use them to identify registry entries.

  • To delete particular registry entries, use the Remove-ItemProperty cmdlet.
  • To delete the value of a registry entry, use the Clear-ItemProperty cmdlet.
Clear-Item HKLM:\Software\MyCompany\MyKey -Confirm

Parametri

-Confirm

Prompts you for confirmation before running the cmdlet.

Proprietà dei parametri

Tipo:SwitchParameter
Valore predefinito:False
Supporta i caratteri jolly:False
DontShow:False
Alias:cf

Set di parametri

(All)
Posizione:Named
Obbligatorio:False
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:False
Valore dagli argomenti rimanenti:False

-Credential

Note

This parameter is not supported by any providers installed with PowerShell. To impersonate another user, or elevate your credentials when running this cmdlet, use Invoke-Command.

Proprietà dei parametri

Tipo:PSCredential
Valore predefinito:Current user
Supporta i caratteri jolly:False
DontShow:False

Set di parametri

(All)
Posizione:Named
Obbligatorio:False
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:True
Valore dagli argomenti rimanenti:False

-Exclude

Specifies, as a string array, an item or items that this cmdlet excludes in the operation. The value of this parameter qualifies the Path parameter. Enter a path element or pattern, such as *.txt. Wildcard characters are permitted. The Exclude parameter is effective only when the command includes the contents of an item, such as C:\Windows\*, where the wildcard character specifies the contents of the C:\Windows directory.

Proprietà dei parametri

Tipo:

String[]

Valore predefinito:None
Supporta i caratteri jolly:True
DontShow:False

Set di parametri

(All)
Posizione:Named
Obbligatorio:False
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:False
Valore dagli argomenti rimanenti:False

-Filter

Specifies a filter to qualify the Path parameter. The FileSystem provider is the only installed PowerShell provider that supports the use of filters. You can find the syntax for the FileSystem filter language in about_Wildcards. Filters are more efficient than other parameters, because the provider applies them when the cmdlet gets the objects rather than having PowerShell filter the objects after they are retrieved.

Proprietà dei parametri

Tipo:String
Valore predefinito:None
Supporta i caratteri jolly:True
DontShow:False

Set di parametri

(All)
Posizione:Named
Obbligatorio:False
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:False
Valore dagli argomenti rimanenti:False

-Force

Indicates that the cmdlet clears items that cannot otherwise be changed, such as read- only aliases. The cmdlet cannot clear constants. Implementation varies from provider to provider. For more information, see about_Providers. The cmdlet cannot override security restrictions, even when the Force parameter is used.

Proprietà dei parametri

Tipo:SwitchParameter
Valore predefinito:False
Supporta i caratteri jolly:False
DontShow:False

Set di parametri

(All)
Posizione:Named
Obbligatorio:False
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:False
Valore dagli argomenti rimanenti:False

-Include

Specifies, as a string array, an item or items that this cmdlet includes in the operation. The value of this parameter qualifies the Path parameter. Enter a path element or pattern, such as "*.txt". Wildcard characters are permitted. The Include parameter is effective only when the command includes the contents of an item, such as C:\Windows\*, where the wildcard character specifies the contents of the C:\Windows directory.

Proprietà dei parametri

Tipo:

String[]

Valore predefinito:None
Supporta i caratteri jolly:True
DontShow:False

Set di parametri

(All)
Posizione:Named
Obbligatorio:False
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:False
Valore dagli argomenti rimanenti:False

-LiteralPath

Specifies a path to one or more locations. The value of LiteralPath is used exactly as it is typed. No characters are interpreted as wildcards. If the path includes escape characters, enclose it in single quotation marks. Single quotation marks tell PowerShell not to interpret any characters as escape sequences.

For more information, see about_Quoting_Rules.

Proprietà dei parametri

Tipo:

String[]

Valore predefinito:None
Supporta i caratteri jolly:False
DontShow:False
Alias:PSPath, LP

Set di parametri

LiteralPath
Posizione:Named
Obbligatorio:True
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:True
Valore dagli argomenti rimanenti:False

-Path

Specifies the path to the items being cleared. Wildcard characters are permitted. This parameter is required, but the parameter name Path is optional.

Proprietà dei parametri

Tipo:

String[]

Valore predefinito:None
Supporta i caratteri jolly:True
DontShow:False

Set di parametri

Path
Posizione:0
Obbligatorio:True
Valore dalla pipeline:True
Valore dalla pipeline in base al nome della proprietà:True
Valore dagli argomenti rimanenti:False

-WhatIf

Shows what would happen if the cmdlet runs. The cmdlet is not run.

Proprietà dei parametri

Tipo:SwitchParameter
Valore predefinito:False
Supporta i caratteri jolly:False
DontShow:False
Alias:wi

Set di parametri

(All)
Posizione:Named
Obbligatorio:False
Valore dalla pipeline:False
Valore dalla pipeline in base al nome della proprietà:False
Valore dagli argomenti rimanenti:False

CommonParameters

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutBuffer, -OutVariable, -PipelineVariable, -ProgressAction, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters.

Input

String

You can pipe a path string to this cmdlet.

Output

None

This cmdlet returns no output.

Note

PowerShell includes the following aliases for Clear-Item:

  • All platforms:

    • cli

  • The Clear-Item cmdlet is supported only by several PowerShell providers, including the Alias, Environment, Function, Registry, and Variable providers. As such, you can use Clear-Item to delete the content of items in the provider namespaces. To list the providers available in your session, type Get-PSProvider. For more information, see about_Providers.

  • You cannot use Clear-Item to delete the contents of a file, because the PowerShell FileSystem provider does not support this cmdlet. To clear files, use the Clear-Content.