cp $HOME/.config/xfce4/mcs_settings/workspaces.xml $HOME/.config/xfce4/mcs_settings/workspaces.xml.backup
start='<option name="Xfwm/WorkspaceCount"'
find='value=".*"'
replace='value="2"'
sed -i -e "\%$start%s,$find,$replace,g" $HOME/.config/xfce4/mcs_settings/workspaces.xml
killall -USR1 xfce-mcs-manager