A Git pre-commit hook for Jekyll to add site update date per commit

pre-commit

#!/bin/sh

# Add current date to the "updated" property in _config.yml
# e.g.,
# updated: 2020-01-01T00:00:00.000Z
export CURRENT_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"`
sed 's/updated:.*$/updated: '${CURRENT_DATE}'/' _config.yml > _config.yml2
mv _config.yml2 _config.yml
git add _config.yml