Remove stylesheet.css from epub files with Linux

Problem:

I cannot use my own font when an open/not-DRM .epub has it’s own stylesheet being forced.

I have not tested this in DRM epubs. Though most modern ones will not have the stylesheet.css forced. So it should be fine.

Solution:

Remove the file using a zip application without extracting.

Script:

Move books to your Linux machine.

Install Zip: sudo pacman -S zip

Save this script as: remove_styles.sh

#!/bin/bash

for epub in *.epub; do
    echo "Processing: $epub"
    zip -d "$epub" "*stylesheet.css"
done

Change permissions: chmod +x remove_styles.sh

Run: ./remove_styles.sh

Copy books again to your device.