Let’s see how to spellcheck a batch of Markdown files with Aspell, a free and open-source spell checker supporting more than 90 different languages1 This post was written for Debian and should work with any Linux flavour: Ubuntu, Linux Mint, ArchLinux, etc. I didn’t test it but MacOS should be supported too. 1. Install aspell Here with the english dictionnary: sudo apt install aspell aspell-en A list of available dictionnaries can be found on gnu.