Wait until a particular event is raised before continuing to run.

      Wait-Event [[-SourceIdentifier] string]
         [-Timeout int] [CommonParameters]

   -SourceIdentifier string
       Wait only for events with the specified source identifier.
       By default, Wait-Events waits for any event.

   -Timeout int
       The maximum time, in seconds, to wait for the event to occur.
       The default, -1, waits indefinitely.
       The timing starts when you submit the Wait-Event command.

       If the specified time is exceeded, the wait ends and the command prompt returns,
       even if the event has not been raised. No error message is displayed.

       -Verbose, -Debug, -ErrorAction, -ErrorVariable, -WarningAction, -WarningVariable,
       -OutBuffer -OutVariable.

Wait-Event suspends execution of a script or function until a particular event is raised. Execution resumes when the event is detected. To cancel the wait, press CTRL+C.

This feature provides an alternative to polling for an event.

The response to an event may be determined in two different ways: by using the -Action parameter of the event subscription and by waiting for an event to return and then respond with an action.


Wait for the next event that is raised:

PS C:\> wait-event

Wait for the next event that is raised with a source identifier of "ProcessStarted":

PS C:\> wait-event -sourceIdentifier "ProcessStarted"

Wait up to 90 seconds, for the next event that is raised with a source identifier of "ProcessStarted":

PS C:\> wait-event -sourceIdentifier "ProcessStarted" -timeout 90

Wait for a timer event on a timer that is set for 2000 milliseconds:

PS C:\> $timer.Interval = 2000
PS C:\> $timer.Autoreset = $false
PS C:\> $timer.Enabled = $true
PS C:\> Wait-Event Timer.Elapsed

“Don't wait for extraordinary opportunities. Seize common occasions and make them great. Weak men wait for opportunities; strong men make them” ~ Orison Swett Marden

Related PowerShell Commands:

Get-Event - Get events in the event queue
Wait-Job - Wait for a background job

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