#! /bin/sh -e

if [ ! -x /usr/sbin/ntpc ]; then exit 0; fi

ntpdc -c peers | {
  any=nil
  while read remote local st poll reach delay offset disp; do
    case "$remote" in
      \**) ;;
      *) continue ;;
    esac
    awk -v off="$offset" 'BEGIN {
      if (off < 0) off = -off;
      if (off >= 0.1) printf "W: absolute time offset %gs worrying\n", off;
      else if (off >= 0.01) printf "I: absolute time offset %gs concerning\n", off;
    }'
    any=t
  done
  case $any in
    nil) echo "W: not sychronized to any peer" ;;
  esac
}