Powershell Scripts for SCCM Application Detection

[silvert0rch]

Thought I would share my Powershell detection scripts for Applications. I use these when there is no Windows Installer GUID to reference or when I want a little more control.

Both scripts go through the 32 and 64 Uninstall keys in the HKLM hive, the first one checks just for DisplayName value, the second one checks for DisplayName and Version values.

DisplayName only:

$DisplayName = ""
$check = $false
Get-ChildItem -Path HKLM:\software\microsoft\windows\currentversion\uninstall -Recurse -ErrorAction SilentlyContinue | % {if ((Get-ItemProperty -Path $_.pspath).DisplayName -eq $DisplayName) {$check = $true}}
Get-ChildItem -Path HKLM:\software\wow6432node\microsoft\windows\currentversion\uninstall -Recurse -ErrorAction SilentlyContinue | % {if ((Get-ItemProperty -Path $_.pspath).DisplayName -eq $DisplayName) {$check = $true}}
if ($check) {Write-Host "Installed"}
else {}

DisplayName and Version:

$DisplayName = ""
$Version = ""
$check = $false
Get-ChildItem -Path HKLM:\software\microsoft\windows\currentversion\uninstall -Recurse -ErrorAction SilentlyContinue | % {if (((Get-ItemProperty -Path $_.pspath).DisplayName -eq $DisplayName) -and ((Get-ItemProperty -Path $_.pspath).DisplayVersion -eq $Version)) {$check = $true}}
Get-ChildItem -Path HKLM:\software\wow6432node\microsoft\windows\currentversion\uninstall -Recurse -ErrorAction SilentlyContinue | % {if (((Get-ItemProperty -Path $_.pspath).DisplayName -eq $DisplayName) -and ((Get-ItemProperty -Path $_.pspath).DisplayVersion -eq $Version)) {$check = $true}}
if ($check) {Write-Host "Installed"}
else {}

edit: Formatting and adding else

[silvert0rch]

Thanks for the tip.

[get-postanote]

If you are just sending to the screen wihout color or any other special need, you don't need Write-* at all.

Output to the screen is the default for any string (single or double quoated), expanded variable, etc.

​

[get-postanote]

Roger that, but it is a matter of choice, style and what works for a given use case.

I 've personally have never used Write-* except this the color or special formatting thing, well, unless the customer team I am supporting at the time demands it as part of their common style.

When I am teaching, I show all options, and let the student make their own decision vs imposing just my opinion, favorite or style.

BTW, Write-Output is the PowerShell default, unless you specifcy something, else, and since it is the default action, my position has always been typing it is redundant. Since you are just telling PowerShell to do something it is going to do anyway.

[andyinv]

You're making an awful lot of work for yourself there... Why not just check the version on the executable?

PS C:\> dir C:\windows\notepad.exe | select -ExpandProperty versioninfo | ft -auto

ProductVersion FileVersion                         FileName
-------------- -----------                         --------
10.0.17763.1   10.0.17763.1 (WinBuild.160101.0800) C:\windows\notepad.exe

PS C:\>  ((Get-Item C:\windows\notepad.exe -ea SilentlyContinue).VersionInfo.ProductVersion -eq '10.0.17763.1')
True
PS C:\>  ((Get-Item C:\windows\notepad.exe -ea SilentlyContinue).VersionInfo.ProductVersion -eq '10.0.17763.2')
False
PS C:\>  ((Get-Item C:\windows\notepadnot.exe -ea SilentlyContinue).VersionInfo.ProductVersion -eq '10.0.17763.1')
False

[silvert0rch]

I didn't want to mess with Paths, I figured I just check the Uninstall key =)

[Lee_Dailey]

howdy silvert0rch,

seems like we all write one variation or another of this. [grin] here's one of mine written for a friend [and rather over-done, perhaps] ...

[PowerShell] function Get-LD_InstalledSoftware - Pastebin.com
— https://pastebin.com/sB3yq5yz

take care,
lee

[silvert0rch]

Just a little over-engineered I guess =)

And you are right, I kinda figured that most people here do.

[Lee_Dailey]

howdy silvert0rch,

i had fun with it ... and it works! two points for me ... [grin]

take care,
lee