import com.atlassian.jira.component.ComponentAccessor;

def schemeManager = ComponentAccessor.issueTypeSchemeManager;

def sb = new StringBuffer();
sb.append("Unused Issue Type Schemes to be deleted:\n");

schemeManager.getAllSchemes().each {
  try{
    if(it.getAssociatedProjectIds().size() == 0 && !it.name.startsWith("Default")) {
      sb.append(it.id + "\t" + it.name + "\n");
      // Comment the line below to just list the schemes
      schemeManager.deleteScheme(it);
    }
  }
  catch(Exception e) {
    sb.append("X\tError: " + e + "\n");
  }
}

return "<pre>" + sb.toString() + "<pre>";

import com.atlassian.jira.component.ComponentAccessor;

def layoutManager = ComponentAccessor.getFieldLayoutManager();

def sb = new StringBuffer();
sb.append("Unused Field Configuration Schemes to be deleted:\n");

layoutManager.getFieldLayoutSchemes().each {
  try {
    if (it.getProjectsUsing().size() == 0) {
      sb.append(it.id + "\t" + it.name + "\n");
      // Comment the line below to just list the schemes
      layoutManager.removeFieldLayoutScheme(it);
    }
  }
  catch (Exception e) {
    sb.append("X\tError: " + e + "\n");
  }
}

return "<pre>" + sb.toString() + "<pre>";