Install vocage and utilities (vs for vocage-stat and vsd for vocage-stat-dir)

yay -S vocage
cp util/vs ~/.local/bin/vs
cp util/vsd ~/.local/bin/vsd

1. To study new lesson

cd kanji
vocage -z 47.tsv

2. To revise learned lesson

cd kanji
vocage -z -s 46.tsv

3. Directory structure:

Each course is a directory. Each lesson is a .tsv file. To check progress of each course, use:

vsd *

To check progress of each lesson, use:

cd kanji
vs *