# Enable the Sonars

**URL:** <https://forum.ubiquityrobotics.com/t/enable-the-sonars/347>\
**Category:** Uncategorized\
**Created:** [August 18, 2019, 3:24pm UTC](https://forum.ubiquityrobotics.com/t/enable-the-sonars/347 "2019-08-18T15:24:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![DavidNeves](https://forum.ubiquityrobotics.com/letter_avatar_proxy/v4/letter/d/e36b37/32.png) [@DavidNeves](https://forum.ubiquityrobotics.com/u/DavidNeves)\
**Post date:** [August 18, 2019, 3:24pm UTC](https://forum.ubiquityrobotics.com/t/enable-the-sonars/347/1 "2019-08-18T15:24:30Z")

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Hello 😃

So, i´m trying to enable the sonars ([https://learn.ubiquityrobotics.com/sensors](https://learn.ubiquityrobotics.com/sensors)) but i can´t edit the file robot.yaml  
I tryed to edit by using the “nano” command, but doesn´t let me save.  
Can someone help me?

Thank you very much.

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**Author:** ![rohbotics](https://forum.ubiquityrobotics.com/user_avatar/forum.ubiquityrobotics.com/rohbotics/32/222_2.png) [@rohbotics](https://forum.ubiquityrobotics.com/u/rohbotics)\
**Post date:** [August 18, 2019, 3:45pm UTC](https://forum.ubiquityrobotics.com/t/enable-the-sonars/347/2 "2019-08-18T15:45:44Z")

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You need to use `sudo nano` to edit the file. `sudo` is a linux command that lets you run as the root user, which is required to make most system-level changes like changes in `/etc`. It is a bit like Run as Administrator on Windows.

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**Author:** ![DavidNeves](https://forum.ubiquityrobotics.com/letter_avatar_proxy/v4/letter/d/e36b37/32.png) [@DavidNeves](https://forum.ubiquityrobotics.com/u/DavidNeves)\
**Post date:** [August 19, 2019, 5:07pm UTC](https://forum.ubiquityrobotics.com/t/enable-the-sonars/347/3 "2019-08-19T17:07:08Z")

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It worked.  
Thank you very much 😃

How do i know that the sonars are working?