ClearUserLog();
//Log Time Started
UserLog("Script Started at " + gs.nowDateTime());

//Query Table
var gr = new GlideRecord('sys_user');
gr.addEncodedQuery('u_business_unit!=NULL^u_business_unit_ref=NULL');
gr.query();

//Update Records
while (gr.next()) {
    // gr.setWorkflow(true);
    gr.setForceUpdate(true);
}

//Log Time Ended
UserLog("Script Ended at " + gs.nowDateTime());