`i` should start with `1`.
In dns alias mode, the fulldomain doesn't have a `_acme-challenge` prefix.
fi
_debug2 domain_list "$domain_list"
- ## for each shortening of our $fulldomain, check if it exists in the $domain_list
- ## can never start on 1 (aka whole $fulldomain) as $fulldomain starts with "_acme-challenge"
- i=2
+ i=1
while [ $i -gt 0 ]; do
## get next longest domain
_domain=$(printf "%s" "$fulldomain" | cut -d . -f "$i"-"$MAX_DOM")