# Logstash iterate through loop

**URL:** https://discuss.elastic.co/t/logstash-iterate-through-loop/265092
**Category:** Logstash
**Created:** [February 22, 2021, 4:32pm UTC](https://discuss.elastic.co/t/logstash-iterate-through-loop/265092 "2021-02-22T16:32:52Z")
**Posts on this page:** 6
**Page:** 1

<div class="post-metadata">

### Author: ![bdn](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bdn/32/136737_2.png) [@bdn](https://discuss.elastic.co/u/bdn)
#### Post date: [February 22, 2021, 4:32pm UTC](https://discuss.elastic.co/t/logstash-iterate-through-loop/265092/1 "2021-02-22T16:32:52Z")

</div>

```auto
if [field2] == 10 {
        mutate { replace => { "field2" => "1" } }
}
if [field2] == 11 {
        mutate { replace => { "field2" => "2" } }
}
if [field2] == 12 {
        mutate { replace => { "field2" => "3" } }
}

```

I have to check conditions up to 20 starting from 10 and replace the field value with a new one that is in serial order, How can I iterate through the loop?

---

<div class="post-metadata">

### Author: ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [February 22, 2021, 4:50pm UTC](https://discuss.elastic.co/t/logstash-iterate-through-loop/265092/2 "2021-02-22T16:50:03Z")

</div>

Use a [translate](https://www.elastic.co/guide/en/logstash/current/plugins-filters-translate.html) filter?

---

<div class="post-metadata">

### Author: ![Iker](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/iker/32/91708_2.png) [@Iker](https://discuss.elastic.co/u/Iker)
#### Post date: [February 22, 2021, 4:52pm UTC](https://discuss.elastic.co/t/logstash-iterate-through-loop/265092/3 "2021-02-22T16:52:39Z")

</div>

I would opt for a ruby filter:

```auto
filter {
     ruby {
        code => "event.set('field2',event.get('field2')-9)
          }
       }

```

---

<div class="post-metadata">

### Author: ![bdn](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bdn/32/136737_2.png) [@bdn](https://discuss.elastic.co/u/bdn)
#### Post date: [February 23, 2021, 2:04am UTC](https://discuss.elastic.co/t/logstash-iterate-through-loop/265092/4 "2021-02-23T02:04:57Z")

</div>

This is not working.

---

<div class="post-metadata">

### Author: ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [February 23, 2021, 2:12am UTC](https://discuss.elastic.co/t/logstash-iterate-through-loop/265092/5 "2021-02-23T02:12:16Z")

</div>

What is not working? What does your configuration look like?

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 23, 2021, 2:13am UTC](https://discuss.elastic.co/t/logstash-iterate-through-loop/265092/6 "2021-03-23T02:13:14Z")

</div>

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