nitesh@nitesh-Precision-WorkStation-T5500:$ VBoxManage snapshot "niteshvm" discardcurrent -state
Oracle VM VirtualBox Command Line Management Interface Version 4.1.22
(C) 2005-2012 Oracle Corporation
All rights reserved.

Usage:

VBoxManage snapshot         <uuid>|<name>
                        take <name> [--description <desc>] [--pause] |
                        delete <uuid>|<name> |
                        restore <uuid>|<name> |
                        restorecurrent |
                        edit <uuid>|<name>|--current
                             [--name <name>]
                             [--description <desc>] |
                        list [--details|--machinereadable]
                        showvminfo <uuid>|<name>


Syntax error: Invalid parameter 'discardcurrent'