Useful if you don't have the Configuration slicing plugin
This script disables all jobs in your Jenkins server
import hudson.model.*
disableChildren(Hudson.instance.items)
def disableChildren(items) {
for (item in items) {
if (item.class.canonicalName == 'com.cloudbees.hudson.plugins.folder.Folder') {
disableChildren(((com.cloudbees.hudson.plugins.folder.Folder) item).getItems())
} else if (item.class.canonicalName != 'org.jenkinsci.plugins.workflow.job.WorkflowJob') {
item.disabled=true
item.save()
println(item.name)
}
}
}