InvokeCommandCommand Class

Definition

Namespace:

Microsoft.PowerShell.Commands

Assembly:

System.Management.Automation.dll

Package:

System.Management.Automation v7.4.0

This cmdlet executes a specified script block on one or more remote machines. The expression or command, as they will be interchangeably called, need to be contained in a script block. This is to ensure two things: 1. The expression that the user has entered is syntactically correct (its compiled) 2. The scriptblock can be converted to a powershell object before transmitting it to the remote end so that it can be run on constrained runspaces in the no language mode

In general, the command script block is executed as if the user had typed it at the command line. The output of the command is the output of the cmdlet. However, since invoke-command is a cmdlet, it will unravel its output: - if the command outputs an empty array, invoke-command will output $null - if the command outputs a single-element array, invoke-command will output that single element.

Additionally, the command will be run on a remote system.

This cmdlet can be called in the following different ways:

Execute a command in a remote machine by specifying the command and machine name invoke-command -Command {get-process} -computername "server1"

Execute a command in a set of remote machines by specifying the command and the list of machines $servers = 1..10 | ForEach-Object {"Server${_}"} invoke-command -command {get-process} -computername $servers

Create a new runspace and use it to execute a command on a remote machine $runspace = New-PSSession -computername "Server1" $credential = get-credential "user01" invoke-command -command {get-process} -Session $runspace -credential $credential

Execute a command in a set of remote machines by specifying the complete uri for the machines $uri = "http://hostedservices.microsoft.com/someservice" invoke-command -command { get-mail } - uri $uri

Create a collection of runspaces and use it to execute a command on a set of remote machines

$serveruris = 1..8 | ForEach-Object {"http://Server${_}/"}
$runspaces = New-PSSession -URI $serveruris
invoke-command -command {get-process} -Session $runspaces

The cmdlet can also be invoked in the asynchronous mode.

invoke-command -command {get-process} -computername $servers -asjob

When the -AsJob switch is used, the cmdlet will emit an PSJob Object. The user can then use the other job cmdlets to work with this object

Note there are two types of errors: 1. Remote invocation errors 2. Local errors.

Both types of errors will be available when the user invokes a receive operation.

The PSJob object has its own throttling mechanism. The result object will be stored in a global cache. If a user wants to retrieve data from the result object the user should be able to do so using the Receive-PSJob cmdlet

The following needs to be noted about exception/error reporting in this cmdlet: The exception objects that are thrown by underlying layers will be written as errors, to avoid stopping the entire cmdlet in case of multi-computername or multi-Session usage (for consistency, this is true even when done using one computername or runspace)

Only one expression may be executed at a time in any single runspace. Attempts to invoke an expression on a runspace that is already executing an expression shall return an error with ErrorCategory ResourceNotAvailable and notify the user that the runspace is currently busy.

Some additional notes:

• invoke-command issues a single scriptblock to the computer or runspace. If a runspace is specified and a command is already running in that runspace, then the second command will fail
• The files necessary to execute the command (cmdlets, scripts, data files, etc) must be present on the remote system; the cmdlet is not responsible for copying them over
• The entire input stream is collected and sent to the remote system before execution of the command begins (no input streaming)
• Input shall be available as $input. Remote Runspaces must reference $input explicitly (input will not automatically be available)
• Output from the command streams back to the client as it is available
• Ctrl-C and pause/resume are supported; the client will send a message to the remote powershell instance.
• By default if no -credential is specified, the host will impersonate the current user on the client when executing the command
• The standard output of invoke-command is the output of the last element of the remote pipeline, with some extra properties added
• If -Shell is not specified, then the value of the environment variable DEFAULTREMOTESHELLNAME is used. If this is not set, then "Microsoft.PowerShell" is used.

public ref class InvokeCommandCommand : Microsoft::PowerShell::Commands::PSExecutionCmdlet, IDisposable

[System.Management.Automation.Cmdlet("Invoke", "Command", DefaultParameterSetName="InProcess", HelpUri="https://go.microsoft.com/fwlink/?LinkID=2096789", RemotingCapability=System.Management.Automation.RemotingCapability.OwnedByCommand)]
public class InvokeCommandCommand : Microsoft.PowerShell.Commands.PSExecutionCmdlet, IDisposable

[<System.Management.Automation.Cmdlet("Invoke", "Command", DefaultParameterSetName="InProcess", HelpUri="https://go.microsoft.com/fwlink/?LinkID=2096789", RemotingCapability=System.Management.Automation.RemotingCapability.OwnedByCommand)>]
type InvokeCommandCommand = class
    inherit PSExecutionCmdlet
    interface IDisposable

Public Class InvokeCommandCommand
Inherits PSExecutionCmdlet
Implements IDisposable

Inheritance

Object

InternalCommand

Cmdlet

PSCmdlet

PSRemotingCmdlet

PSRemotingBaseCmdlet

PSExecutionCmdlet

InvokeCommandCommand

Attributes

CmdletAttribute

Implements

IDisposable

Constructors

InvokeCommandCommand()

Fields

ComputerInstanceIdParameterSet	Computername with session instance ID parameter set. (Inherited from PSRemotingCmdlet)
ComputerNameParameterSet	Computername parameter set. (Inherited from PSRemotingCmdlet)
ContainerIdParameterSet	Container ID parameter set. (Inherited from PSRemotingCmdlet)
DefaultPowerShellRemoteShellAppName	Default application name for the connection uri. (Inherited from PSRemotingCmdlet)
DefaultPowerShellRemoteShellName	Default shellname. (Inherited from PSRemotingCmdlet)
FilePathComputerNameParameterSet	FilePathComputername parameter set. (Inherited from PSExecutionCmdlet)
FilePathContainerIdParameterSet	Container ID file path parameter set. (Inherited from PSExecutionCmdlet)
FilePathSessionParameterSet	FilePathRunspace parameter set. (Inherited from PSExecutionCmdlet)
FilePathSSHHostHashParameterSet	SSH Host file path parameter set with HashTable connection parameter. (Inherited from PSExecutionCmdlet)
FilePathSSHHostParameterSet	SSH Host file path parameter set. (Inherited from PSExecutionCmdlet)
FilePathUriParameterSet	FilePathUri parameter set. (Inherited from PSExecutionCmdlet)
FilePathVMIdParameterSet	VM guid file path parameter set. (Inherited from PSExecutionCmdlet)
FilePathVMNameParameterSet	VM name file path parameter set. (Inherited from PSExecutionCmdlet)
LiteralFilePathComputerNameParameterSet	LiteralFilePathComputername parameter set. (Inherited from PSExecutionCmdlet)
SessionParameterSet	Runspace parameter set. (Inherited from PSRemotingCmdlet)
SSHHostHashParameterSet	SSH host parmeter set supporting hash connection parameters. (Inherited from PSRemotingCmdlet)
SSHHostParameterSet	SSH host parameter set. (Inherited from PSRemotingCmdlet)
UriParameterSet	Uri parameter set. (Inherited from PSRemotingBaseCmdlet)
UseWindowsPowerShellParameterSet	Parameter set to use Windows PowerShell. (Inherited from PSRemotingCmdlet)
VMIdParameterSet	VM guid parameter set. (Inherited from PSRemotingCmdlet)
VMNameParameterSet	VM name parameter set. (Inherited from PSRemotingCmdlet)

Properties

AllowRedirection	The AllowRedirection parameter enables the implicit redirection functionality.
ApplicationName	This parameters specifies the appname which identifies the connection end point on the remote machine. If this parameter is not specified then the value specified in DEFAULTREMOTEAPPNAME will be used. If that's not specified as well, then "WSMAN" will be used.
ArgumentList	Arguments that are passed to this scriptblock. (Inherited from PSExecutionCmdlet)
AsJob	Specifies if the cmdlet needs to be run asynchronously.
Authentication	Authentication mechanism to authenticate the user.
CertificateThumbprint	Specifies the certificate thumbprint to be used to impersonate the user on the remote machine. (Inherited from PSRemotingBaseCmdlet)
CommandOrigin	This property tells you if you were being invoked inside the runspace or if it was an external request. (Inherited from InternalCommand)
CommandRuntime	Holds the command runtime object for this command. This object controls what actually happens when a write is called. (Inherited from Cmdlet)
ComputerName	This parameter represents the address(es) of the remote computer(s). The following formats are supported: (a) Computer name (b) IPv4 address : 132.3.4.5 (c) IPv6 address: 3ffe:8311:ffff:f70f:0:5efe:172.30.162.18.
ConfigurationName	For WSMan session: If this parameter is not specified then the value specified in the environment variable DEFAULTREMOTESHELLNAME will be used. If this is not set as well, then Microsoft.PowerShell is used. For VM/Container sessions: If this parameter is not specified then no configuration is used.
ConnectingTimeout	Gets and sets a value in milliseconds that limits the time allowed for an SSH connection to be established.
ConnectionUri	A complete URI(s) specified for the remote computer and shell to connect to and create runspace for.
ContainerId	ID of target container. (Inherited from PSExecutionCmdlet)
Credential	Specifies the credentials of the user to impersonate in the remote machine. If this parameter is not specified then the credentials of the current user process will be assumed.
CurrentPSTransaction	Gets an object that surfaces the current PowerShell transaction. When this object is disposed, PowerShell resets the active transaction. (Inherited from Cmdlet)
DisconnectedSessionName	Session names optionally provided for Disconnected parameter. (Inherited from PSExecutionCmdlet)
EnableNetworkAccess	When set and in loopback scenario (localhost) this enables creation of WSMan host process with the user interactive token, allowing PowerShell script network access, i.e., allows going off box. When this property is true and a PSSession is disconnected, reconnection is allowed only if reconnecting from a PowerShell session on the same box.
Events	Gets the event manager for the current runspace. (Inherited from PSCmdlet)
FilePath	The script block that the user has specified in the cmdlet. This will be converted to a powershell before its actually sent to the remote end.
HideComputerName	Hide/Show computername of the remote objects.
Host	Gets the host interaction APIs. (Inherited from PSCmdlet)
HostName	Host name for an SSH remote connection.
InDisconnectedSession	Specifies that after the command is invoked on a remote computer the remote session should be disconnected.
InputObject	Input object which gets assigned to $input when executed on the remote machine. This is the only parameter in this cmdlet which will bind with a ValueFromPipeline=true. (Inherited from PSExecutionCmdlet)
InvokeAndDisconnect	Indicates that if a job/command is invoked remotely the connection should be severed right have invocation of job/command. (Inherited from PSExecutionCmdlet)
InvokeCommand	Provides access to utility routines for executing scripts and creating script blocks. (Inherited from PSCmdlet)
InvokeProvider	Gets the instance of the provider interface APIs for the current runspace. (Inherited from PSCmdlet)
IsLiteralPath	True if FilePath should be processed as a literal path. (Inherited from PSExecutionCmdlet)
JobManager	Manager for JobSourceAdapters registered. (Inherited from PSCmdlet)
JobName	Friendly name for the job object if AsJob is used.
JobRepository	Repository for jobs. (Inherited from PSCmdlet)
KeyFilePath	Key Path.
MyInvocation	Contains information about the identity of this cmdlet and how it was invoked. (Inherited from PSCmdlet)
NoNewScope	When executing a scriptblock in the current session, tell the cmdlet not to create a new scope.
Options	Hashtable containing options to be passed to OpenSSH.
PagingParameters	If the cmdlet declares paging support (via SupportsPaging), then PagingParameters property contains arguments of the paging parameters. Otherwise PagingParameters property is null. (Inherited from PSCmdlet)
ParameterSetName	The name of the parameter set in effect. (Inherited from PSCmdlet)
Port	Port specifies the alternate port to be used in case the default ports are not used for the transport mechanism (port 80 for http and port 443 for useSSL)
RemoteDebug	When selected this parameter causes a debugger Step-Into action for each running remote session.
ResolvedComputerNames	Computer names after they have been resolved (null, empty string, "." resolves to localhost) (Inherited from PSRemotingBaseCmdlet)
RunAsAdministrator	When set, PowerShell process inside container will be launched with high privileged account. Otherwise (default case), PowerShell process inside container will be launched with low privileged account.
ScriptBlock	The script block that the user has specified in the cmdlet. This will be converted to a powershell before its actually sent to the remote end.
Session	The PSSession object describing the remote runspace using which the specified cmdlet operation will be performed.
SessionName	Specifies the name of the returned session when the InDisconnectedSession switch is used.
SessionOption	Extended Session Options for controlling the session creation. Use "New-WSManSessionOption" cmdlet to supply value for this parameter.
SessionState	Gets the instance of session state for the current runspace. (Inherited from PSCmdlet)
SSHConnection	Hashtable array containing SSH connection parameters for each remote target ComputerName (Alias: HostName) (required) UserName (optional) KeyFilePath (Alias: IdentityFilePath) (optional)
SSHTransport	This parameter specifies that SSH is used to establish the remote connection and act as the remoting transport. By default WinRM is used as the remoting transport. Using the SSH transport requires that SSH is installed and PowerShell remoting is enabled on both client and remote machines.
Stopping	Is this command stopping? (Inherited from Cmdlet)
Subsystem	Gets and sets a value for the SSH subsystem to use for the remote connection.
ThrottleLimit	Allows the user of the cmdlet to specify a throttling value for throttling the number of remote operations that can be executed simultaneously.
UserName	User Name.
UseSSL	This parameter suggests that the transport scheme to be used for remote connections is useSSL instead of the default http.Since there are only two possible transport schemes that are possible at this point, a SwitchParameter is being used to switch between the two.
VMId	Guid of target virtual machine. (Inherited from PSExecutionCmdlet)
VMName	Name of target virtual machine. (Inherited from PSExecutionCmdlet)

Methods

BeginProcessing()	Creates the helper classes for the specified parameter set.
CloseAllInputStreams()	Closes the input streams on all the pipelines. (Inherited from PSExecutionCmdlet)
CreateHelpersForSpecifiedComputerNames()	Creates helper objects with the command for the specified remote computer names. (Inherited from PSExecutionCmdlet)
CreateHelpersForSpecifiedContainerSession()	Creates helper objects with the command for the specified container IDs or names. (Inherited from PSExecutionCmdlet)
CreateHelpersForSpecifiedRunspaces()	Creates helper objects with the specified command for the specified remote runspaceinfo objects. (Inherited from PSExecutionCmdlet)
CreateHelpersForSpecifiedSSHComputerNames()	Creates helper objects for SSH remoting computer names remoting. (Inherited from PSExecutionCmdlet)
CreateHelpersForSpecifiedSSHHashComputerNames()	Creates helper objects for SSH remoting from HashTable parameters. (Inherited from PSExecutionCmdlet)
CreateHelpersForSpecifiedUris()	Creates helper objects with the command for the specified remote connection uris. (Inherited from PSExecutionCmdlet)
CreateHelpersForSpecifiedVMSession()	Creates helper objects with the command for the specified VM GUIDs or VM names. (Inherited from PSExecutionCmdlet)
CurrentProviderLocation(String)	(Inherited from PSCmdlet)
Dispose()	Dispose the cmdlet.
EndProcessing()	InvokeAsync would have been called in ProcessRecord. Wait here for all the results to become available.
GetResolvedProviderPathFromPSPath(String, ProviderInfo)	(Inherited from PSCmdlet)
GetResourceString(String, String)	Gets the resource string corresponding to baseName and resourceId from the current assembly. You should override this if you require a different behavior. (Inherited from Cmdlet)
GetScriptBlockFromFile(String, Boolean)	Reads content of file and converts it to a scriptblock. (Inherited from PSExecutionCmdlet)
GetUnresolvedProviderPathFromPSPath(String)	(Inherited from PSCmdlet)
GetVariableValue(String, Object)	(Inherited from PSCmdlet)
GetVariableValue(String)	(Inherited from PSCmdlet)
Invoke()	Invoke this cmdlet object returning a collection of results. (Inherited from Cmdlet)
Invoke<T>()	Returns a strongly-typed enumerator for the results of this cmdlet. (Inherited from Cmdlet)
ParseSshHostName(String, String, String, Int32)	Parse a hostname used with SSH Transport to get embedded username and/or port. (Inherited from PSRemotingBaseCmdlet)
ProcessRecord()	The expression will be executed in the remote computer if a remote runspace parameter or computer name or uri is specified.
ResolveAppName(String)	Determines the appname to be used based on the following order: 1. AppName parameter specified 2. DEFAULTREMOTEAPPNAME variable set 3. WSMan. (Inherited from PSRemotingCmdlet)
ResolveComputerName(String)	Resolves a computer name. If its null or empty its assumed to be localhost. (Inherited from PSRemotingCmdlet)
ResolveComputerNames(String[], String[])	Resolve all the machine names provided. Basically, if a machine name is '.' assume localhost. (Inherited from PSRemotingCmdlet)
ResolveShell(String)	Determines the shellname to use based on the following order: 1. ShellName parameter specified 2. DEFAULTREMOTESHELLNAME variable set 3. PowerShell. (Inherited from PSRemotingCmdlet)
ShouldContinue(String, String, Boolean, Boolean, Boolean)	Confirm an operation or grouping of operations with the user. This differs from ShouldProcess in that it is not affected by preference settings or command-line parameters, it always does the query. This variant offers Yes, No, YesToAll and NoToAll. (Inherited from Cmdlet)
ShouldContinue(String, String, Boolean, Boolean)	Confirm an operation or grouping of operations with the user. This differs from ShouldProcess in that it is not affected by preference settings or command-line parameters, it always does the query. This variant offers Yes, No, YesToAll and NoToAll. (Inherited from Cmdlet)
ShouldContinue(String, String)	Confirm an operation or grouping of operations with the user. This differs from ShouldProcess in that it is not affected by preference settings or command-line parameters, it always does the query. This variant only offers Yes/No, not YesToAll/NoToAll. (Inherited from Cmdlet)
ShouldProcess(String, String, String, ShouldProcessReason)	Confirm the operation with the user. Cmdlets which make changes (e.g. delete files, stop services etc.) should call ShouldProcess to give the user the opportunity to confirm that the operation should actually be performed. This variant allows the caller to specify the complete text describing the operation, rather than just the name and action. (Inherited from Cmdlet)
ShouldProcess(String, String, String)	Confirm the operation with the user. Cmdlets which make changes (e.g. delete files, stop services etc.) should call ShouldProcess to give the user the opportunity to confirm that the operation should actually be performed. This variant allows the caller to specify the complete text describing the operation, rather than just the name and action. (Inherited from Cmdlet)
ShouldProcess(String, String)	Confirm the operation with the user. Cmdlets which make changes (e.g. delete files, stop services etc.) should call ShouldProcess to give the user the opportunity to confirm that the operation should actually be performed. This variant allows the caller to specify text for both the target resource and the action. (Inherited from Cmdlet)
ShouldProcess(String)	Confirm the operation with the user. Cmdlets which make changes (e.g. delete files, stop services etc.) should call ShouldProcess to give the user the opportunity to confirm that the operation should actually be performed. (Inherited from Cmdlet)
StopProcessing()	This method is called when the user sends a stop signal to the cmdlet. The cmdlet will not exit until it has completed executing the command on all the runspaces. However, when a stop signal is sent, execution needs to be stopped on the pipelines corresponding to these runspaces.
ThrowTerminatingError(ErrorRecord)	Terminate the command and report an error. (Inherited from Cmdlet)
TransactionAvailable()	Returns true if a transaction is available and active. (Inherited from Cmdlet)
ValidateComputerName(String[])	Validates computer names to check if none of them happen to be a Uri. If so this throws an error. (Inherited from PSRemotingBaseCmdlet)
ValidateRemoteRunspacesSpecified()	Validate the PSSession objects specified and write appropriate error records. (Inherited from PSRemotingBaseCmdlet)
WriteCommandDetail(String)	Write text into pipeline execution log. (Inherited from Cmdlet)
WriteDebug(String)	Display debug information. (Inherited from Cmdlet)
WriteError(ErrorRecord)	Internal variant: Writes the specified error to the error pipe. (Inherited from Cmdlet)
WriteInformation(InformationRecord)	Route information to the user or host. (Inherited from Cmdlet)
WriteInformation(Object, String[])	Route information to the user or host. (Inherited from Cmdlet)
WriteObject(Object, Boolean)	Writes one or more objects to the output pipe. If the object is a collection and the enumerateCollection flag is true, the objects in the collection will be written individually. (Inherited from Cmdlet)
WriteObject(Object)	Writes the object to the output pipe. (Inherited from Cmdlet)
WriteProgress(ProgressRecord)	Display progress information. (Inherited from Cmdlet)
WriteVerbose(String)	Display verbose information. (Inherited from Cmdlet)
WriteWarning(String)	Display warning information. (Inherited from Cmdlet)