[PowerCLI] Disconnect-VISession

Function Disconnect-ViSession {
<#
.SYNOPSIS
Disconnects a connected vCenter Session.

.DESCRIPTION
Disconnects a open connected vCenter Session.

.PARAMETER  SessionList
A session or a list of sessions to disconnect.

.EXAMPLE
PS C:\> Get-VISession | Where { $_.IdleMinutes -gt 5 } | Disconnect-ViSession

.EXAMPLE
PS C:\> Get-VISession | Where { $_.Username -eq “User19″ } | Disconnect-ViSession

.AUTHOR
 Alan Renouf

.SOURCE
 https://blogs.vmware.com/PowerCLI/2011/09/list-and-disconnect-vcenter-sessions.html

.OBTAINED
 12/15/2015

.EDITED
 Ryan Simeone - 12/15/2015
#>

[CmdletBinding()]

Param(
      [Parameter(ValueFromPipeline=$true)]
      $SessionList,

      [switch]
      $All
      )

Process {

    #Prevent disconnecting sessions in vSphere Client
    If(!$All){
        $SessionList = $SessionList | Where-Object {$_.UserAgent -notlike "VMWare*"}
    }

    #Prevent error trying to disconnect your current session, use Disconnect-VIServer
    $SessionList = $SessionList | Where-Object {$_.Status -ne "Current Session"}

    $SessionMgr = Get-View $DefaultViserver.ExtensionData.Client.ServiceContent.SessionManager

    ForEach($Session in $SessionList){

        Write “Disconnecting Session for $($Session.Username) which has been active since $($Session.LoginTime)”
        $key = $Session.Key
        $SessionMgr.TerminateSession($key)

        }
    }
}