monitoring ntpd's status

#!/bin/ksh

# $Id$
# vim:set ts=2 sw=2 et ai:

# monitor the interval between "when" and "poll", sleep until they are expected
# to be updated

SLEEPTIME=0
IFS=''
while sleep $(($SLEEPTIME+1)); do
  BUF=`ntpq -p`
  echo $BUF
  SLEEPTIME=`echo $BUF | awk '
BEGIN {
  # 1 minute sleep if we cant find anything
  rv = 60
}
$5 ~ /^[0-9]+$/ && $6 ~ /^[0-9]+$/ {
  if ($6 - $5 < rv && $6 - $5 > 0) {
    rv = $6 - $5
  }
}
END {
  print rv
}'`
  echo "; next query expected in $SLEEPTIME seconds"
done