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April 19, 2017 at 1:53 am

Alright, I think I've figured it out, using the help files, but want confirmation. I'm looking at Stop-service, and its 3 parameter sets.

NAME
Stop-Service

SYNOPSIS
Stops one or more running services.

SYNTAX
Stop-Service [-InputObject] [-Exclude ] [-Force] [-Include ] [-PassThru]
[-Confirm] [-WhatIf] []

Stop-Service [-Exclude ] [-Force] [-Include ] [-PassThru] -DisplayName [-Confirm]
[-WhatIf] []

Stop-Service [-Name] [-Exclude ] [-Force] [-Include ] [-PassThru] [-Confirm]
[-WhatIf] []

-DisplayName
Specifies the display names of the services to be stopped. Wildcards are permitted.

Required? true
Position? named
Default value
Accept pipeline input? false
Accept wildcard characters? true

-InputObject
Specifies ServiceController objects representing the services to be stopped. Enter a variable that contains
the objects, or type a command or expression that gets the objects.

Required? true
Position? 1
Default value
Accept pipeline input? true (ByValue)
Accept wildcard characters? false

-Name
Specifies the service names of the services to be stopped. Wildcards are permitted.

The parameter name is optional. You can use "Name" or its alias, "ServiceName", or you can omit the parameter
name.

Required? true
Position? 1
Default value
Accept pipeline input? true (ByPropertyName, ByValue)
Accept wildcard characters? true

In particular, I was (am?) baffled by the second parameter set. I couldn't figure out how the service to be stopped was sent into it. But looking closely, I did notice the Displayname way down the parameter set. So, the reason its listed so far back from the beginning is that its named, not positional? And it would never be used as part of a pipeline... though I would imagine that a parenthesized get-service could be used in the parameter to supply it with some display names....

Does all that even make sense? It seems like it would be the least used of the 3 parameter sets, off the top of my head.

April 20, 2017 at 9:39 pm

I think the key here is that the neither the Exclude or the Include parameters accept pipeline input so if you pass a string representing the service's Display Name to Stop-Service the only parameter it can bind to will be DisplayName.

If Exclude or Include accepted input from the pipeline then the DisplayName parameter would have to be in position 0.