> 
> **Possible Duplicate:**  
> 
> [What does it mean “bash < <( curl rvm.io/releases/rvm-install-head )”](https://stackoverflow.com/questions/4096962/what-does-it-mean-bash-curl-http-rvm-beginrescueend-com-releases-rvm-ins) 
> 
> 
> 

I'm working to install Ruby on Rails on Mac OS X lion and came across several tutorials which called on this line:

```
bash < <(curl -s https://rvm.io/install/rvm)

```

I don't know what the `bash < <` bit is for.

What does this line do?

Thanks