#!/bin/sh
#
# Generate an estimate of your GPS's offset from a peerstats file
# For instructions on how to use this script, see the GPSD Time 
# Service HOWTO in this distrubution. 
#
awk '
     /127\.127\.28\.0/ { sum += $5 * 1000; cnt++; }
     END { print sum / cnt; }
' </var/log/ntpstats/peerstats