PowerShell string interpolation not working

Question

I'm starting to learn powershell scripting and I'm getting stuck on a simple problem (surely due to my inexperience): string interpolation.

I'm trying to print a list of directories that I'm obtaining with the Get-ChildItem cmdlet. I've read in tutorials that to output a property of an object inside a string you should use "${$variable.property}", so I tried with this code:

foreach($pluginDir in Get-ChildItem -Path "./Plugins" -Directory){
    Write-Host "Found plugin directory ${$pluginDir.FullName}"
}

The Get-ChildItem command is working correctly (I've tried by printing $pluginDir.FullName directly without interpolating it inside the string), however the string interpolation is not. All I get in the output from the above code is:

Found plugin directory
Found plugin directory
Found plugin directory
...

what am I doing wrong here?

To debug use following inside the foreach : $pluginDir | Format-Table Format table is great for enumerating through objects and displaying all the properties. The property FullName doesn't exist. Format-Table will give all the property names. — jdweng
– jdweng, Commented Jan 16, 2023 at 10:56

Paolo · Accepted Answer · 2023-01-16 10:48:12Z

2

The correct syntax would be:

Write-Host "Found plugin directory $($pluginDir.FullName)"

More on command substitution: https://learn.microsoft.com/en-us/powershell/scripting/learn/deep-dives/everything-about-string-substitutions?view=powershell-7.3#command-substitution

answered Jan 16, 2023 at 10:48

Paolo

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1 Comment

Master_T Over a year ago

Thanks, it works, apparently the tutorial I was following was talking s**t 😅

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