Clear-Content
Deletes the contents of an item, but does not delete the item.
語法
Path (Default) - FileSystem provider
Clear-Content
[-Path] <String[]>
[-Filter <String>]
[-Include <String[]>]
[-Exclude <String[]>]
[-Force]
[-Credential <PSCredential>]
[-WhatIf]
[-Confirm]
[-UseTransaction]
[-Stream <String>]
[<CommonParameters>]
LiteralPath - FileSystem provider
Clear-Content
-LiteralPath <String[]>
[-Filter <String>]
[-Include <String[]>]
[-Exclude <String[]>]
[-Force]
[-Credential <PSCredential>]
[-WhatIf]
[-Confirm]
[-UseTransaction]
[-Stream <String>]
[<CommonParameters>]
Path (Default) - All providers
Clear-Content
[-Path] <String[]>
[-Filter <String>]
[-Include <String[]>]
[-Exclude <String[]>]
[-Force]
[-Credential <PSCredential>]
[-WhatIf]
[-Confirm]
[-UseTransaction]
[<CommonParameters>]
LiteralPath - All providers
Clear-Content
-LiteralPath <String[]>
[-Filter <String>]
[-Include <String[]>]
[-Exclude <String[]>]
[-Force]
[-Credential <PSCredential>]
[-WhatIf]
[-Confirm]
[-UseTransaction]
[<CommonParameters>]
Description
The Clear-Content cmdlet deletes the contents of an item, such as deleting the text from a file,
but it does not delete the item. As a result, the item exists, but it is empty. Clear-Content is
similar to Clear-Item, but it works on items with contents, instead of items with values.
範例
Example 1: Delete all content from a directory
Clear-Content "..\SmpUsers\*\init.txt"
This command deletes all of the content from the init.txt files in all subdirectories of the
SmpUsers directory. The files are not deleted, but they are empty.
Example 2: Delete content of all files with a wildcard
Clear-Content -Path "*" -Filter "*.log" -Force
This command deletes the contents of all files in the current directory with the .log file name
extension, including files with the read-only attribute. The asterisk (*) in the path represents
all items in the current directory. The Force parameter makes the command effective on read-only
files. Using a filter to restrict the command to files with the .log file name extension instead
of specifying *.log in the path makes the operation faster.
Example 3: Clear all data from a stream
This example shows how the Clear-Content cmdlet clears the content from an alternate data stream
while leaving the stream intact.
The first command uses the Get-Content cmdlet to get the content of the Zone.Identifier stream
in the Copy-Script.ps1 file, which was downloaded from the internet.
The second command uses the Clear-Content cmdlet to clear the content.
The third command repeats the first command. It verifies that the content is cleared, but the stream remains. If the stream were deleted, the command would generate an error.
You can use a method like this one to clear the content of an alternate data stream. However, it is
not the recommended way to eliminate security checks that block files that are downloaded from the
Internet. If you verify that a downloaded file is safe, use the Unblock-File cmdlet.
Get-Content C:\Test\Copy-Script.ps1 -Stream Zone.Identifier
[ZoneTransfer]
ZoneId=3
Clear-Content C:\Test\Copy-Script.ps1 -Stream Zone.Identifier
Get-Content C:\Test\Copy-Script.ps1 -Stream Zone.Identifier
參數
-Confirm
Prompts you for confirmation before running the cmdlet.
參數屬性
| 類型: | SwitchParameter |
| 預設值: | False |
| 支援萬用字元: | False |
| 不要顯示: | False |
| 別名: | cf |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | 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.
參數屬性
| 類型: | PSCredential |
| 預設值: | Current user |
| 支援萬用字元: | False |
| 不要顯示: | False |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | True |
| 來自剩餘引數的值: | False |
-Exclude
Specifies, as a string array, strings that this cmdlet omits from the path to the content. The value
of this parameter qualifies the Path parameter. Enter a path element or pattern, such as
*.txt. Wildcards are permitted.
參數屬性
| 類型: | String[] |
| 預設值: | None |
| 支援萬用字元: | True |
| 不要顯示: | False |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | False |
-Filter
Specifies a filter in the provider's format or language. The value of this parameter qualifies the Path parameter. The syntax of the filter, including the use of wildcards, depends on the provider. Filters are more efficient than other parameters, because the provider applies them when retrieving the objects, rather than having PowerShell filter the objects after they are retrieved.
參數屬性
| 類型: | String |
| 預設值: | None |
| 支援萬用字元: | True |
| 不要顯示: | False |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | False |
-Force
Forces the command to run without asking for user confirmation.
參數屬性
| 類型: | SwitchParameter |
| 預設值: | False |
| 支援萬用字元: | False |
| 不要顯示: | False |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | False |
-Include
Specifies, as a string array, content that this cmdlet clears. The value of this parameter qualifies
the Path parameter. Enter a path element or pattern, such as *.txt. Wildcards are permitted.
參數屬性
| 類型: | String[] |
| 預設值: | None |
| 支援萬用字元: | True |
| 不要顯示: | False |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | False |
-LiteralPath
Specifies the paths to the items from which content is deleted. Unlike the Path parameter, 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 having PowerShell not to interpret any characters as escape sequences.
參數屬性
| 類型: | String[] |
| 預設值: | None |
| 支援萬用字元: | False |
| 不要顯示: | False |
| 別名: | PSPath |
參數集
LiteralPath
| Position: | Named |
| 必要: | True |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | True |
| 來自剩餘引數的值: | False |
-Path
Specifies the paths to the items from which content is deleted. Wildcards are permitted. The paths must be paths to items, not to containers. For example, you must specify a path to one or more files, not a path to a directory. Wildcards are permitted. This parameter is required, but the parameter name (Path) is optional.
參數屬性
| 類型: | String[] |
| 預設值: | None |
| 支援萬用字元: | True |
| 不要顯示: | False |
參數集
Path
| Position: | 0 |
| 必要: | True |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | True |
| 來自剩餘引數的值: | False |
-Stream
This is a dynamic parameter made available by the FileSystem provider.
Specifies an alternative data stream for content. If the stream does not exist, this cmdlet creates it. Wildcard characters are not supported.
You can use the Clear-Content cmdlet to change the content of any alternate data stream, such as
Zone.Identifier. However, we do not recommend this as a way to eliminate security checks that
block files that are downloaded from the internet. If you verify that a downloaded file is safe,
use the Unblock-File cmdlet.
This parameter was introduced in Windows PowerShell 3.0.
For more information, see about_FileSystem_Provider.
參數屬性
| 類型: | String |
| 預設值: | None |
| 支援萬用字元: | False |
| 不要顯示: | False |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | False |
-UseTransaction
Includes the command in the active transaction. This parameter is valid only when a transaction is in progress. For more information, see about_Transactions.
參數屬性
| 類型: | SwitchParameter |
| 預設值: | False |
| 支援萬用字元: | False |
| 不要顯示: | False |
| 別名: | usetx |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | False |
-WhatIf
Shows what would happen if the cmdlet runs. The cmdlet is not run.
參數屬性
| 類型: | SwitchParameter |
| 預設值: | False |
| 支援萬用字元: | False |
| 不要顯示: | False |
| 別名: | wi |
參數集
(All)
| Position: | Named |
| 必要: | False |
| 來自管線的值: | False |
| 來自管線按屬性名稱的值: | False |
| 來自剩餘引數的值: | 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.
輸入
None
You can't pipe objects to this cmdlet.
輸出
None
This cmdlet returns no output.
備註
Windows PowerShell includes the following aliases for Clear-Content:
clc
You can use Clear-Content with the PowerShell FileSystem provider and with other providers that
manipulate content. To clear items that are not considered to be content, such as items managed by
the PowerShell Certificate or Registry providers, use Clear-Item.
The Clear-Content cmdlet is designed to work with the data exposed by any provider.
To list the providers available in your session, type Get-PSProvider.
For more information, see about_Providers.
