Tips Linux Dhclient Force Time Update

#!/bin/sh
   # Filename:     /etc/dhcp/dhclient-exit-hooks.d/ntp_force_update
   # Purpose:      Used by dhclient-script to set the time of the system
   #
       
   # Do not update hostname for virtual machine IP assignments
   if [ "$interface" != "eth0" ] && [ "$interface" != "eth1" ] && [ "$interface" != "wlan0" ]
   then
           return
   fi
       
   if [ "$reason" != BOUND ] && [ "$reason" != RENEW ] && [ "$reason" != REBIND ] && [ "$reason" != REBOOT ]
   then
      return
   fi
     
   service ntp status >/dev/null 2>&1 && 
   (
     sleep 5 && 
     service ntp stop && 
     ntpd -qg ; 
     service ntp start; 
     touch /tmp/force_update
   ) &
   
    systemctl status systemd-timesyncd.service >/dev/null 2>&1 && 
   (
     sleep 5 && 
     systemctl status systemd-timesyncd.service stop && 
     timedatectl ; 
     systemctl status systemd-timesyncd.service start; 
     touch /tmp/force_update
   ) &

curl -s https://wiki.gsi.de/pub/Epics/TipsLinuxDhclientForceTimeUpdate/_etc_dhcp_dhclient-exit-hooks.d_ntp_force_update -o $file && 
   dos2unix $file && 
   chmod a+r $file