How can I uninstall an application using PowerShell?

$app = Get-WmiObject -Class Win32_Product | Where-Object { 
    $_.Name -match "Software Name" 
}

$app.Uninstall()

Edit: Rob found another way to do it with the Filter parameter:

$app = Get-WmiObject -Class Win32_Product `
                     -Filter "Name = 'Software Name'"

To fix up the second method in Jeff Hillman's post, you could either do a:

$app = Get-WmiObject 
            -Query "SELECT * FROM Win32_Product WHERE Name = 'Software Name'"

Or

$app = Get-WmiObject -Class Win32_Product `
                     -Filter "Name = 'Software Name'"

One line of code:

get-package *notepad* |% { & $_.Meta.Attributes["UninstallString"]}

function Uninstall-App {
    Write-Output "Uninstalling $($args[0])"
    foreach($obj in Get-ChildItem "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall") {
        $dname = $obj.GetValue("DisplayName")
        if ($dname -contains $args[0]) {
            $uninstString = $obj.GetValue("UninstallString")
            foreach ($line in $uninstString) {
                $found = $line -match '(\{.+\}).*'
                If ($found) {
                    $appid = $matches[1]
                    Write-Output $appid
                    start-process "msiexec.exe" -arg "/X $appid /qb" -Wait
                }
            }
        }
    }
}

Call it this way:

Uninstall-App "Autodesk Revit DB Link 2019"

I will make my own little contribution. I needed to remove a list of packages from the same computer. This is the script I came up with.

$packages = @("package1", "package2", "package3")
foreach($package in $packages){
  $app = Get-WmiObject -Class Win32_Product | Where-Object {
    $_.Name -match "$package"
  }
  $app.Uninstall()
}

I hope this proves to be useful.

Note that I owe David Stetler the credit for this script since it is based on his.

For msi installs, "uninstall-package whatever" works fine. For non-msi installs (Programs provider), it takes more string parsing. This should also take into account if the uninstall exe is in a path with spaces and is double quoted. Install-package works with msi's as well.

$uninstall = get-package whatever | % { $_.metadata['uninstallstring'] }
# split quoted and unquoted things on whitespace
$prog, $myargs = $uninstall | select-string '("[^"]*"|\S)+' -AllMatches | 
  % matches | % value
$prog = $prog -replace '"',$null  # call & operator doesn't like quotes
$silentoption = '/S'
$myargs += $silentoption  # add whatever silent uninstall option
& $prog $myargs  # run uninstaller silently

Start-process doesn't mind the double quotes, if you need to wait anyway:

# "C:\Program Files (x86)\myapp\unins000.exe"
get-package myapp | foreach { start -wait $_.metadata['uninstallstring'] /SILENT }