killall cmd for PowerShell with completion

killall.ps1

# In a PS terminal, type "code $profile" and put this in there

function killall {
    param(
        [ArgumentCompleter(
            {
                param($cmd, $param, $values)
                get-process |
                ? { $_.Name.StartsWith($values, [StringComparison]::OrdinalIgnoreCase) } |
                Sort  -Unique Name |
                Select -ExpandProperty Name
            }
        )]
        $ProcessName)
    stop-process -Name $ProcessName
}