How to get the current directory of the cmdlet being executed

Question

This should be a simple task, but I have seen several attempts on how to get the path to the directory where the executed cmdlet is located with mixed success. For instance,

Answer 1

Path is often null. This function is safer.

function Get-ScriptDirectory
{
    $Invocation = (Get-Variable MyInvocation -Scope 1).Value;
    if($Invocation.PSScriptRoot)
    {
        $Invocation.PSScriptRoot;
    }
    Elseif($Invocation.MyCommand.Path)
    {
        Split-Path $Invocation.MyCommand.Path
    }
    else
    {
        $Invocation.InvocationName.Substring(0,$Invocation.InvocationName.LastIndexOf("\"));
    }
}