# How to add a space or comma(,) between two concatenating fields using mutate?
**URL:** https://discuss.elastic.co/t/how-to-add-a-space-or-comma-between-two-concatenating-fields-using-mutate/43945
**Category:** Logstash
**Created:** [March 9, 2016, 8:43pm UTC](https://discuss.elastic.co/t/how-to-add-a-space-or-comma-between-two-concatenating-fields-using-mutate/43945 "2016-03-09T20:43:24Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@vikas\_gopal](https://discuss.elastic.co/u/vikas_gopal)
#### Post date: [March 9, 2016, 8:43pm UTC](https://discuss.elastic.co/t/how-to-add-a-space-or-comma-between-two-concatenating-fields-using-mutate/43945/1 "2016-03-09T20:43:24Z")
Hi Experts ,
Please help me to achieve as follow .I want something like
Fullname= vikas , gopal
With below mutate output is like **vikasgopal**. So I want to add , in-between first an last
`mutate {add_field => {"Fullname" => "%{first}%{last}"}}`
Thanks
VG
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [March 10, 2016, 7:11am UTC](https://discuss.elastic.co/t/how-to-add-a-space-or-comma-between-two-concatenating-fields-using-mutate/43945/2 "2016-03-10T07:11:24Z")
So... add the space or comma to the string?
```
mutate {add_field => {"Fullname" => "%{first} %{last}"}}
```
---
### Author:  [@vikas\_gopal](https://discuss.elastic.co/u/vikas_gopal)
#### Post date: [March 10, 2016, 7:55am UTC](https://discuss.elastic.co/t/how-to-add-a-space-or-comma-between-two-concatenating-fields-using-mutate/43945/3 "2016-03-10T07:55:17Z")
I tried it before posting this question , at that point it did not work but now it is working . Well thanks again Magnus
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 5:07am UTC](https://discuss.elastic.co/t/how-to-add-a-space-or-comma-between-two-concatenating-fields-using-mutate/43945/4 "2017-07-06T05:07:36Z")