In the upgrade process from [update.angular.io](https://update.angular.io/):

> 
> Remove deprecated RxJS 6 features using rxjs-tslint auto update rules.
> 
> 
> For most applications this will mean running the following two commands:
> 
> 
> 
> ```
> npm install -g rxjs-tslint
> rxjs-5-to-6-migrate -p src/tsconfig.app.json
> 
> ```
> 
> 

But when I follow these steps and run `rxjs-5-to-6-migrate -p src/tsconfig.app.json` I'm getting the error:

```
rxjs-5-to-6-migrate: command not found

```

Is there any reason why this command isn't working?