• [ ] logical AND, OR
• [ ] pipe, short circuit
• [ ] redirect (> vs >>)
• [ ] if du -b /dev/null > /dev/null 2>&1; then
• [ ] command -v systemctl > /dev/null 2>&1

cat > file.json <<- EOF
{
    "supervisor": "${HASSIO_DOCKER}",
    "homeassistant": "${HOMEASSISTANT_DOCKER}",
    "data": "${DATA_SHARE}"
}
EOF