Measure-Object Differences

Klaas Vandenberghe notes a discrepancy in how Measure-Object works, based on syntax:

So, is the -InputObject parameter broken? Not really, but we need to be aware of the logic behind it.
Maybe we are used to work with -ComputerName for a lot of cmdlets and functions, and we rely blindly upon the ability of the command to handle whatever collection we provide. We know this executes the action we chose, like Get-DbaSqlService or Get-DbaOperatingSystemor whatever, separately to every computer in the collection. The collection is ‘fold out’, ‘unpacked’, ‘split’.

-InputObject doesn’t do that! Is that wrong? Not necessarily, it may be a choice of design to have possibilities to enquire the properties of the collection itself and those of the ‘members’ or ‘children’. It’s just a surprise the behaviour differs from pipeline input to parameter input.

Something to keep in mind when writing Powershell scripts.

Related Posts

Storing Credentials For Containers

Andrew Pruski shows how to store a credential using Powershell and pass it into a Docker container: I work with SQL Server in containers pretty much exclusively when testing code and one of my real bug bears is that SQL Server in containers does not support Windows authentication (unless you’re using Windocks). So when I’m working […]

Read More

Using Powershell To Deploy Perfmon Collectors

Raul Gonzalez has a bonus post in his Perfmon data series: As I said, when it’s time to deploy the solution explained in my previous posts to a number of servers it might get very tedious, specially if we have servers running multiple instances, since each have different counter names because the instance name is […]

Read More


August 2017
« Jul Sep »