jenkins-org-clean.groovy

import jenkins.*
import jenkins.model.*
import hudson.*
import hudson.model.*

MAX_BUILDS = 20

for (organization in Jenkins.instance.items) { 	
	for (project in organization.items) {
		int count = 0
		String workspace = project.jobsDir
		File folder = new File(workspace)
		if(folder!=null && folder.exists()) {
			for (folders in folder.listFiles()) {
				File builds = new File(folders.path + "/builds")
				if (builds!=null && builds.exists()) {
				File[] files = builds.listFiles().sort() {
					a,b -> b.lastModified().compareTo a.lastModified()
				}.each {
					if(!it.isFile() && it.name.isNumber()) {
						if(count > MAX_BUILDS) {
							println it.path + " -- Delete"
							it.deleteDir()
						}
						count++
					}
				}
			    }	
			}
		}
	}		
}

Clean out the builds directories to recover space in the Jenkins Home

This script is scary btw - ended up with several paused in flight builds losing their jobs folder during an input hold and then failing afterwards