Split jenkins variable and trigger multiple jobs - jenkins

Question

I need to clean up some Kubernete namespaces(hello_namespace, second,my_namespace1, my_namespace45,my_namespace44 for example and I do it with a jenkins job.
I read with kubectl the namespace I need to clean up and then I want to fire a job to delete it, My code should be something like that
pipeline {
agent { label 'master' }
stages {
stage('Clean e2e') {
steps {
script {
sh "kubectl get namespace |egrep 'my_namespace[0-9]+'|cut -f1 -d ' '>result.txt"
def output=readFile('result.txt').trim()
}
}
}
The ouput of this code will be the variable $output with the values:
my_namespace1
my_namespace45
my_namespace44
Separated by line, now I want to fire a job with the namespace like parameter , how can I do that? (My problem is to read the file and fire independent job for each namespace)
while (output.nextLine() callJob)
The job call should be like
build job: 'Delete temp Stage', parameters:
[string(name: 'Stage', value: "${env.stage_name}")]

Answer 1

I already got it :)
#!groovy
pipeline {
agent { label 'master' }
stages {
stage('Clean up stages') {
steps {
script {
sh '(kubectl get namespace |egrep "namespace[0-9]+"|cut -f1 -d " "|while read i;do echo -n $i";" ; done;)>result.txt'
def stages = readFile('result.txt').trim().split(';')
for (stage in stages) {
if (stage?.trim()) {
echo "deleting stage: $stage"
build job: 'Delete temp Stage', parameters:
[string(name: 'Stage', value: "$stage")]
}
}
}
}
}
}
}