Update-MpSignature
Updates the antimalware definitions on a computer.
Syntax
Default (Default)
Update-MpSignature
[-UpdateSource <UpdateSource>]
[-CimSession <CimSession[]>]
[-ThrottleLimit <Int32>]
[-AsJob]
[<CommonParameters>]
Description
The Update-MpSignature cmdlet updates the antimalware definitions with the latest definitions available on an update server.
Examples
Example 1: Update signatures
PS C:\> Update-MpSignature
This command updates the antimalware definitions. By default, the cmdlet uses the sources configured through SignatureFallbackOrder. If no signature fallback order is configured, the cmdlet uses the default update source.
Example 2: Update signatures from a specific source
PS C:\> Update-MpSignature -UpdateSource MicrosoftUpdateServer
This command updates the antimalware definitions from the Microsoft Update Server.
Parameters
-AsJob
Runs the cmdlet as a background job. Use this parameter to run commands that take a long time to complete.
The cmdlet immediately returns an object that represents the job and then displays the command prompt.
You can continue to work in the session while the job completes.
To manage the job, use the *-Job cmdlets.
To get the job results, use the Receive-Job cmdlet.
For more information about Windows PowerShell background jobs, see about_Jobs.
Parameter properties
| Type: | SwitchParameter |
| Default value: | None |
| Supports wildcards: | False |
| DontShow: | False |
Parameter sets
(All)
| Position: | Named |
| Mandatory: | False |
| Value from pipeline: | False |
| Value from pipeline by property name: | False |
| Value from remaining arguments: | False |
-CimSession
Runs the cmdlet in a remote session or on a remote computer. Enter a computer name or a session object, such as the output of a New-CimSession or Get-CimSession cmdlet. The default is the current session on the local computer.
Parameter properties
| Type: | CimSession[] |
| Default value: | None |
| Supports wildcards: | False |
| DontShow: | False |
| Aliases: | Session |
Parameter sets
(All)
| Position: | Named |
| Mandatory: | False |
| Value from pipeline: | False |
| Value from pipeline by property name: | False |
| Value from remaining arguments: | False |
-ThrottleLimit
Specifies the maximum number of concurrent operations that can be established to run the cmdlet.
If this parameter is omitted or a value of 0 is entered, then Windows PowerShell® calculates an optimum throttle limit for the cmdlet based on the number of CIM cmdlets that are running on the computer.
The throttle limit applies only to the current cmdlet, not to the session or to the computer.
Parameter properties
| Type: | Int32 |
| Default value: | None |
| Supports wildcards: | False |
| DontShow: | False |
Parameter sets
(All)
| Position: | Named |
| Mandatory: | False |
| Value from pipeline: | False |
| Value from pipeline by property name: | False |
| Value from remaining arguments: | False |
-UpdateSource
Specifies an update source. This cmdlet downloads updated definitions from the server you specify. If you do not specify this parameter, the cmdlet uses the sources configured through SignatureFallbackOrder. If no signature fallback order is configured, the cmdlet uses Microsoft Update Server, then Microsoft Malware Protection Center (MMPC) as an update source. The acceptable values for this parameter are:
- InternalDefinitionUpdateServer
- MicrosoftUpdateServer
- MMPC
- FileShares
If you specify the InternalDefinitionUpdateServer setting, the service checks for updates on the Windows Software Update Services (WSUS) server.
Parameter properties
| Type: | UpdateSource |
| Default value: | None |
| Accepted values: | InternalDefinitionUpdateServer, MicrosoftUpdateServer, MMPC, FileShares |
| Supports wildcards: | False |
| DontShow: | False |
Parameter sets
(All)
| Position: | Named |
| Mandatory: | False |
| Value from pipeline: | False |
| Value from pipeline by property name: | False |
| Value from remaining arguments: | 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.