But the first issue for me was: how do I enter the characters in Linux?
My day to day desktop is Gnome 3, so I looked up the character keys to use on a US keyboard. To enter them you hold down the Shift and Ctrl keys, press 'u' and then the code for the accented letter you want. Remember, you hold down the Shift and Control keys through the entire keystroke sequence.
Cuanta más sepa!