jenkins-cleanup.groovy

import hudson.model.*
import hudson.tasks.*
for(item in Hudson.instance.items) {
    print("job "+item.name)
    item.buildDiscarder = new LogRotator(-1, 5, -1, -1)
    println (" configured")  
}

for(item in Hudson.instance.items) {
    print("job "+item.name)
  try {
    item.logRotate()
    println (" rotated")  
  } catch (IOException e) {
    println("################### FAILED" + e.message)
  }
}