# Troubleshooting "Permission denied" error when attempting to run BaseSpace CLI on Linux and Mac OS

**Background**

The error below occurs when attempting to invoke the BaseSpace Command Line Interface (CLI) program (using the **bs** command) in either Linux or Mac OS when the file permissions have not been set to make the program executable. This typically occurs after the program is first downloaded when users attempt to authenticate against their BaseSpace account.

```
$ ./bs authbash: ./bs: Permission denied  
```

**Solution:**\
Set the permissions for the bs binary file (the BaseSpace CLI program) so it is "executable" using the **chmod** program built into most Linux and Mac OS Bash environments.

```
$ chmod 766 </path/to/bs>  # Has the same effect as the command below on a newly downloaded copy of the BaseSpace CLI binary$ chmod u+x </path/to/bs>  
```

For more information, see [Install BaseSpace Sequence Hub CLI](https://developer.basespace.illumina.com/docs/content/documentation/cli/cli-overview#Install) on the BaseSpace Developers page.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #3380), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000003380%20-%20Software%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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