OVH Ghost mutualised DNS checker

OVHGhostNSCheck.sh

#!/usr/bin/env sh

# Domain name to retrieve ghost host RR from
__ARG_DOMAIN=${1:-example.com}

# Setup the name or IP of the ghost OVH mutu hosting DNS
__ARG_GHOST_NS=${2:-dns200.anycast.me.}

old_ip=$(
  dig +short +norecurs "$__ARG_DOMAIN" "@$__ARG_GHOST_NS" -t A 2>/dev/null
  )

if [ -n "$old_ip" ]; then

  old_host=$(dig +short -x "$old_ip")

  printf 'On %s, domain name: %s\n' "$(date -R)" "$__ARG_DOMAIN"
  printf 'still has a RR in DNS: %s\n' "$__ARG_GHOST_NS"
  printf 'with IP, host: %s, %s.\n' "$old_ip" "$old_host"
else
  printf 'Domain name %s has no RR on DNS %s.\n' \
  "$__ARG_DOMAIN" "$__ARG_GHOST_NS" >&2
  exit 1
fi