Groovy script to update jenkins label

Update Jenkins Label

import hudson.model.*
import hudson.model.labels.LabelAtom

updateJenkinsLabel(Hudson.instance.items,"<Replace With Old Label>", "<Replace With new Label")

def updateJenkinsLabel(items, oldLabel, newLabel) {

  for (item in items) {
	    // Find out if it is a folder
		   if (item.class.canonicalName != 'com.cloudbees.hudson.plugins.folder.Folder') {
		         if(item instanceof FreeStyleProject || item instanceof hudson.maven.MavenModuleSet) {
              	 if(item.assignedLabel != null && item.assignedLabel.name.equals(oldLabel) ) {
					              item.assignedLabel = new LabelAtom(newLabel) 	
                        item.save()
					              println("JOB: " + item.name + " has label "+oldLabel + " updated with "+newLabel)
                  } 			
		          }
		   } else {
			    updateJenkinsLabel(((com.cloudbees.hudson.plugins.folder.Folder) item).getItems(), oldLabel, newLabel)
		  }
	 }
}