If you want to remove the fortune cookie messages that appear whenever you open a Terminal in Linux Mint, here is how to do it.
Click the Menu and then Terminal (or press Ctrl + Alt + T) to open a Terminal and then enter this command:
gksu gedit /etc/bash.bashrc
Scroll down to the bottom of the file and comment out (or remove) the line /usr/games/fortune:
Press the Save button.
Source: Mint forum