fix format

dnsapi/dns_internetbs.sh

@@ -133,7 +133,7 @@ _get_root() {
     fi
 
     while true; do
-      h=$(printf "%s" "$domain" | cut -d . -f ${i}-100)
+      h=$(printf "%s" "$domain" | cut -d . -f "${i}"-100)
       _debug h "$h"
       if [ -z "$h" ]; then
         #not valid
@@ -141,7 +141,7 @@ _get_root() {
       fi
 
       if _contains "$response" "\"$h\""; then
-        _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-${p})
+        _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-"${p}")
         _domain=${h}
         return 0
       fi