Betty is an application similar to Siri and Google now. It turns your command line into a virtual assistant. Unlike Siri or Google Now, Betty doesn't take voice commands. But you can type your text into the command line and she'll answer you. See the screenshot below for examples of how Betty works.
Here's how you can install it in Linux Mint 17.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each:
sudo apt-get install ruby curl git
cd && git clone https://github.com/pickhardt/betty
echo "alias betty=\"~/betty/main.rb\"" >> ~/.bashrc && source ~/.bashrc
3. Use this command to turn on Betty's web mode for Internet searches:
betty turn web mode on
Source: Noobs Lab
Additional resources for Betty
Additional Linux Mint resources