Retrack solution with PowerShell

Set-ExecutionPolicy unrestricted
echo " "
echo "MySharepointSolution"
$sln = get-spsolution -identity MySharepointSolution.wsp
uninstall-spsolution -identity MySharepointSolution.wsp -confirm:$false
echo "Started solution retraction..." 
while($sln.JobExists) {
echo " > Working..."
start-sleep -s 10 
}
remove-spsolution -identity MySharepointSolution.wsp -confirm:$false
echo "Removed MySharepointSolution"
echo " "