To create a gemset we need to create a .rvmrc file.

Syntax:

 $ rvm --rvmrc --create <ruby-version>@<gemsetname>

Example:

 $ rvm --rvmrc --create ruby-2.2.2@myblog

The above line will create a .rvmrc file in the root directory of the app.

To get the list of available gemsets, use the following command:

 $ rvm list gemsets

The Ruby Version Manager is a command line tool to simply install and manage different versions of Ruby.

• rvm istall 2.3.1 for example installs Ruby version 2.3.1 on your machine.

• With rvm list you can see which versions are installed and which is actually set for use.

    user@dev:~$ rvm list
    
    rvm rubies
    
    =* ruby-2.3.1 [ x86_64 ]
    
    # => - current
    # =* - current && default
    #  * - default
  

• With rvm use 2.3.0 you can change between installed versions.