Wait-Job - PowerShell command help and examples

Suppresses the command prompt until one or all of the Windows PowerShell background jobs running in the session are complete. (Wait-Job)


NAME
Wait-Job
SYNOPSIS
Suppresses the command prompt until one or all of the Windows PowerShell background jobs running in the session are complete.
SYNTAX
Wait-Job [[-InstanceId] <Guid[]>] [-Any] [-Timeout <int>] [<CommonParameters>] Wait-Job [-Job] <Job[]> [-Any] [-Timeout <int>] [<CommonParameters>] Wait-Job [[-Name] <string[]>] [-Any] [-Timeout <int>] [<CommonParameters>] Wait-Job [-Id] <Int32[]> [-Any] [-Timeout <int>] [<CommonParameters>] Wait-Job [-State {NotStarted | Running | Completed | Failed | Stopped | Blocked}] [-Any] [-Timeout <int>] [<CommonParameters>]
DESCRIPTION
The Wait-Job cmdlet waits for Windows PowerShell background jobs to complete before it displays the command prompt. You can wait until any background job is complete, or until all background jobs are complete, and you can set a maximum wait time for the job. You can use Wait-Job to get background jobs that were started by using Start-Job or the AsJob parameter of Invoke-Command. When the commands in the job are complete, Wait-Job displays the command prompt and returns a job object so that you can pipe it to another command.
PARAMETERS
-Any [<SwitchParameter>] Displays the command prompt (and returns the job object) when any job completes. By default, Wait-Job waits until all of the specified jobs are complete before displaying the prompt. Required? false Position? named Default value Accept pipeline input? false Accept wildcard characters? false -Id <Int32[]> Waits for jobs with the specified IDs. The ID is an integer that uniquely identifies the job within the current session. It is easier to remember and type than the InstanceId, but it is unique only within the current session. You can type one or more IDs (separated by commas). To find the ID of a job, type "Get-Job" without parameters. Required? true Position? 1 Default value Accept pipeline input? true (ByPropertyName) Accept wildcard characters? false -InstanceId <Guid[]> Waits for jobs with the specified instance IDs. The default is all jobs. An instance ID is a GUID that uniquely identifies the job on the computer. To find the instance ID of a job, use Get-Job. Required? false Position? 1 Default value Accept pipeline input? true (ByPropertyName) Accept wildcard characters? false -Job <Job[]> Waits for the specified jobs. Enter a variable that contains the job objects or a command that gets the job objects. You can also use a pipeline operator to send job objects to the Wait-Job cmdlet. By default, Wait-Job waits for all jobs created in the current session. Required? true Position? 1 Default value Accept pipeline input? true (ByValue, ByPropertyName) Accept wildcard characters? false -Name <string[]> Waits for jobs with the specified friendly name. Required? false Position? 1 Default value Accept pipeline input? true (ByPropertyName) Accept wildcard characters? false -State <JobState> Waits for jobs in the specified state. Valid values are NotStarted, Running, Completed, Stopped, Failed, and Blocked. Required? false Position? named Default value Accept pipeline input? true (ByPropertyName) Accept wildcard characters? false -Timeout <int> Determines the maximum wait time for each background job, in seconds. The default, -1, waits until the job completes, no matter how long it runs. The timing starts when you submit the Wait-Job command, not the Start-Job command. If this time is exceeded, the wait ends and the command prompt returns, even if the job is still running. No error message is displayed. Required? false Position? named Default value Accept pipeline input? false Accept wildcard characters? false <CommonParameters> This cmdlet supports the common parameters: Verbose, Debug, ErrorAction, ErrorVariable, WarningAction, WarningVariable, OutBuffer and OutVariable. For more information, type, "get-help about_commonparameters".
INPUTS
System.Management.Automation.RemotingJob You can pipe a job object to Wait-Job.
OUTPUTS
System.Management.Automation.RemotingJob Wait-Job returns job objects that represent the completed jobs. If the wait ends because the value of the Timeout parameter is exceeded, Wait-Job does not return any objects.
NOTES

Examples

EXAMPLE 1
C:\PS>get-job | wait-job
Description
----------- This command waits for all of the background jobs running in the session to complete.
EXAMPLE 2
C:\PS>$s = new-pssession server01, server02, server03 C:\PS> invoke-command -session $s -scriptblock {start-job -name Date1 -scriptblock {get-date}} C:\PS> $done = invoke-command -session $s -command {wait-job -name Date1} C:\PS> $done.count 3
Description
----------- This example shows how to use the Wait-Job cmdlet with jobs started on remote computers by using the Start-Job cmdlet. Both the Start-Job and Wait-Job commands are submitted to the remote computer by using the Invoke-Command cmdlet. This example uses Wait-Job to determine whether a Get-Date command running as a background job on three different computers is complete. The first command creates a Windows PowerShell session (PSSession) on each of the three remote computers and stores them in the $s variable. The second command uses the Invoke-Command cmdlet to run a Start-Job command in each of the three sessions in $s. All of the jobs are named Date1. The third command uses the Invoke-Command cmdlet to run a Wait-Job command. This command waits for the Date1 jobs on each computer to complete. It stores the resulting collection (array) of job objects in the $done variable. The fourth command uses the Count property of the array of job objects in the $done variable to determine how many of the jobs are complete.
EXAMPLE 3
C:\PS>$s = new-pssession (get-content machines.txt) C:\PS> $c = 'get-eventlog -log system | where {$_.EntryType -eq "error" -and $_.Source -eq "LSASRV"} | out-file errors.txt' C:\PS> invoke-command -session $s -scriptblock {param($c)start-job -scriptblock {$c}} -ArgumentList $c C:\PS> invoke-command -session $s -scriptblock {wait-job -any}
Description
----------- This example uses the Any parameter of Wait-Job to determine when the first of many background jobs running in the current session are complete. It also shows how to use the Wait-Job cmdlet to wait for remote jobs to complete. The first command creates a PSSession on each of the computers listed in the Machines.txt file and stores the PSSessions in the $s variable. The command uses the Get-Content cmdlet to get the contents of the file. The Get-Content command is enclosed in parentheses to ensure that it runs before the New-PSSession command. The second command stores a Get-EventLog command string (in quotation marks) in the $c variable. The third command uses the Invoke-Command cmdlet to run a Start-Job command in each of the sessions in $s. The Start-Job command starts a background job that runs the command in $c. Because the $c variable is on the local computer, the command uses the "param" keyword to declare the local variables in the command and the ArgumentList parameter to supply the values for those variables. The fourth command uses the Invoke-Command cmdlet to run a Wait-Job command in the sessions. It uses the Wait-Job cmdlet to wait until the first job on the remote computers is complete.
EXAMPLE 4
C:\PS>$s = new-pssession Server01, Server02, Server03 C:\PS> $jobs = invoke-command -session $s -scriptblock {start-job -script {get-date}} C:\PS> $done = invoke-command -session $s -scriptblock {wait-job -timeout 30}
Description
----------- This example shows how to use the Timeout parameter of Wait-Job to set a maximum wait time for the jobs running on remote computers. The first command creates a PSSession on each of three remote computers (Server01, Server02, and Server03), and it saves the PSSessions in the $s variable. The second command uses the Invoke-Command cmdlet to run a Start-Job command in each of the PSSessions in $s. It saves the resulting job objects in the $jobs variable. The third command uses the Invoke-Command cmdlet to run a Wait-Job command in each of the PSSessions in $s. The Wait-Job command determines whether all of the commands have completed within 30 seconds. It uses the Timeout parameter with a value of 30 (seconds) to establish the maximum wait time and saves the results of the command in the $done variable. In this case, after 30 seconds, only the command on the Server02 computer has completed. Wait-Job ends the wait, displays the command prompt, and returns the object that represents the job that was completed. The $done variable contains a job object that represents the job that ran on Server02.
EXAMPLE 5
C:\PS>wait-job -id 1,2,5 -any
Description
----------- This command identifies three jobs by their IDs and waits until any of them are complete. The command prompt returns when the first job completes.
EXAMPLE 6
C:\PS>wait-job -name DailyLog -timeout 120
Description
----------- This command waits 120 seconds (two minutes) for the DailyLog job to complete. If the job does not complete in the next two minutes, the command prompt returns anyway, and the job continues to run in the background.
EXAMPLE 7
C:\PS>wait-job -name Job3
Description
----------- This Wait-Job command uses the job name to identify the job to wait for.
EXAMPLE 8
C:\PS>C:\PS> $j = start-job -script {get-childitem *.ps1| where {$_lastwritetime -gt ((get-date) - (new-timespan -days 7))}} C:\PS> $j | wait-job
Description
----------- This example shows how to use the Wait-Job cmdlet with jobs started on the local computer by using the Start-Job cmdlet. These commands start a job that gets the Windows PowerShell script files that were added or updated in the last week. The first command uses the Start-Job cmdlet to start a background job on the local computer. The job runs a Get-ChildItem command that gets all of the files with a ".ps1" file name extension that were added or updated in the last week. The third command uses the Wait-Job cmdlet to wait until the job is complete. When the job completes, the command displays the job object, which contains information about the job.
EXAMPLE 9
C:\PS>$s = new-pssession Server01, Server02, Server03 C:\PS> $j = invoke-command -session $s -scriptblock {get-process} -asjob C:\PS> $j | wait-job
Description
----------- This example shows how to use the Wait-Job cmdlet with jobs started on remote computers by using the AsJob parameter of the Invoke-Command cmdlet. When using AsJob, the job is created on the local computer and the results are automatically returned to the local computer, even though the job runs on the remote computers. This example uses Wait-Job to determine whether a Get-Process command running in the sessions on three remote computers is complete. The first command creates PSSessions on three computers and stores them in the $s variable. The second command uses the Invoke-Command cmdlet to run a Get-Process command in each of the three PSSessions in $s. The command uses the AsJob parameter to run the command asynchronously as a background job. The command returns a job object, just like the jobs started by using Start-Job, and the job object is stored in the $j variable. The third command uses a pipeline operator (|) to send the job object in $j to the Wait-Job cmdlet. Notice that an Invoke-Command command is not required in this case, because the job resides on the local computer. -------------------------- EXAMPLE 10 -------------------------- C:\PS>get-job Id Name State HasMoreData Location Command -- ---- ----- ----------- -------- ------- 1 Job1 Completed True localhost,server01.. get-service 4 Job4 Completed True localhost dir | where C:\PS> wait-job -id 1
Description
----------- This command waits for the job with an ID value of 1. RELATED LINKS Online version: http://go.microsoft.com/fwlink/?LinkID=113422 about_Jobs about_Job_Details about_Remote_Jobs Start-Job Get-Job Receive-Job Stop-Job Remove-Job Invoke-Command C:\Windows>powershell get-help Remove-Job -full

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