add dig missing warning

web/whatismyip

@@ -12,6 +12,11 @@ for (( i=1; i<=$#; i++ )); do
   [[ "${!i}" = "-n" ]] && { NAME=1; continue; }
 done                       
 
+which dig &> /dev/null || {
+  echo Install apt dnsutils >&2
+  exit 1
+} 
+   
 
 IP=$( dig +short myip.opendns.com @resolver1.opendns.com )