How to Clone a VDI file from Virtualbox Command Line

>$VBoxManage clonehd "$(pwd)/TinyWS.vdi" "$(pwd)/wam.vdi" -format VDI
VirtualBox Command Line Management Interface Version 3.1.2
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Clone hard disk created in format 'VDI'. UUID: 289c3021-1959-47ac-8f27-94069b4b182c