#!/bin/csh
#Birds-Eye.Net UNIX Daylight Savings Time Adjustment ScriptBack to Birds-Eye.Net Script Archive
#
#<![CDATA[#<PRE>
######################### DO NOT REMOVE THIS HEADER #################################
# #
# Birds-Eye Network Services, LLC #
# Birds-Eye.Net's UNIX Daylight Savings Time Adjustment Script #
# bens_dst.csh #
# #
# This c-shell script can be used to automatically adjust the time of a UNIX server #
# so that it correctly observes daylight savings time (DST). #
# #
# By: Bruce Bahlmann #
# (C) Copyright, Birds-Eye Network Services, LLC, ALL RIGHTS RESERVED #
# #
# NOTICE: All use of the software (in whole or in part) is restricted. Any sale, #
# marketing, distribution, or transfer of software copies, associated data, source #
# code, information (including manuals), configuration files, or licenses are #
# restricted. Internal use of this software requires a license and/or express #
# written permission from Birds-Eye Network Services, LLC. Any other use of this #
# software is restricted. This software is not sold as part of an enterprise #
# license and thus is restricted as such. #
# #
# To purchase access rights to this software contact: #
# Birds-Eye.Net, LLC #
# info[_at_]birds-eye.net #
# OR go to www.birds-eye.net/consulting to obtain a license #
# #
######################### DO NOT REMOVE THIS HEADER #################################
# Generic Daylight Savings Time script
# Created: 08/23/2000
# Version: 01.01 10/22/2000 bbahlmann Only add/removes DST (region independent)
# Version: 01.00 08/23/2000 bbahlmann initial release
#
# dst.csh automatically changes the timezone in accordance with Daylight
# Savings Time. This script will make the correct edit to /etc/TIMEZONE to
# begin or end DST observance. This script can also be run from the command
# line.
#
# TODO:
# Unfortunitely, this dst.csh currently requires a reboot to apply changes
# (on the server) after this change. This could be easily added to the script
# but may not be desirable... Need to find a better way to apply this change
# across all running applications.
#
### INSTRUCTIONS: #############################################################
#
# Set system specific information below and then make the suggested CRON entry as
# below. Note, that depending on where you live, the /etc/TIMEZONE entry for TZ must
# be set correctly for which TIMEZONE you live in (e.g. central-USA --> TZ=CST6). If
# the TIMEZONE is set incorrectly this DST script will adversely change your time.
#
# [cron entry]
# * * * * * /etc/dst.csh > /dev/null 2>&1
#
## system/location specific
set tzfile = "/etc/TIMEZONE" ## path to TIMEZONE file
set loc = "USA" ## supported locations: USA, EEC
## Note ECC is for most contries in western europe
#### END OF EDITABLE CONFIGURATIONS ###########################################
## read in date particulars
set wd = `date +%w` ## Day of week 0-7 where 0=Sunday
set day = `date +%d` ## Day of month 01-31
set mon = `date +%m` ## Month of year 01-12
set hr = `date +%H` ## Hour 00-23
set min = `date +%M` ## Minute 00-59
if ($wd != 0) then
echo "Invalid day for DST change [Sundays only] -- aborting"
exit(-1)
## Only proceed between the hour of 1:55 AM and 1:59 AM -- otherwise abort
else if (($hr != 01) || ($min <= 54)) then
echo "Hr [$hr] Min [$min] incorrect must be 1:55-59 -- aborting"
## A sunday on days 01-07 would represent the FIRST sunday of a given month
## A sunday on days 25-31 would represent the LAST sunday of a given month (of 31 days)
else if ($loc == "USA") then
## run only in April (04) and October (10)
if ($mon == 04) then
## determine if it is the first SUNDAY of month
if ((01 <= $day) && ($day <= 07)) then
## begin DST
set tz = `grep ^TZ= $tzfile`
set dst_less_tz = `echo $tz|sed s/DST//`
if ($tz == $dst_less_tz) then
## TZ does not contain trailing DST string -- backup and add it to start DST
cp $tzfile $tzfile\.old
sed s/^$tz/$tz\DST/ $tzfile > $tzfile\.new
cp $tzfile\.new $tzfile
set ntz = `grep '^TZ=' $tzfile`
echo "TZ changed from [$tz] to [$ntz] -- now observing DST"
else
echo "DST already set [$tz] -- aborting"
endif
else
echo "Not first SUNDAY in APRIL -- cannot change DST"
endif
else if ($mon == 10) then
## determine if it is the first SUNDAY of month
if ((25 <= $day) && ($day <= 31)) then
## end DST
set tz = `grep '^TZ=' $tzfile`
set dst_less_tz = `echo $tz|sed s/DST//`
if ($tz != $dst_less_tz) then
## TZ contains trailing DST string -- backup and remove it to end DST
cp $tzfile $tzfile\.old
sed s/^$tz/$dst_less_tz/ $tzfile > $tzfile\.new
cp $tzfile\.new $tzfile
set ntz = `grep '^TZ=' $tzfile`
echo "TZ changed from [$tz] to [$ntz] -- no longer observing DST"
else
echo "DST already removed [$tz] -- aborting"
endif
else
echo "Not last SUNDAY in OCTOBER -- cannot change off DST"
endif
else
echo "Not a valid month [$mon] to change DST"
endif
else if ($loc == "EEC") then
## run only in March (03) and October (10)
if ($mon == 03) then
## determine if it is the first SUNDAY of month
if ((25 <= $day) && ($day <= 31)) then
## begin DST
set tz = `grep ^TZ= $tzfile`
set dst_less_tz = `echo $tz|sed s/DST//`
if ($tz == $dst_less_tz) then
## TZ does not contain trailing DST string -- backup and add it
cp $tzfile $tzfile\.old
sed s/^$tz/$tz\DST/ $tzfile > $tzfile\.new
cp $tzfile\.new $tzfile
set ntz = `grep '^TZ=' $tzfile`
echo "TZ changed from [$tz] to [$ntz] -- now observing DST"
else
echo "DST already set [$tz] -- aborting"
endif
else
echo "Not last SUNDAY in MARCH -- cannot change DST"
endif
else if ($mon == 10) then
## determine if it is the first SUNDAY of month
if (25 >= $day <= 31) then
## end DST
set tz = `grep ^TZ= $tzfile`
set dst_less_tz = `echo $tz|sed s/DST//`
if ($tz != $dst_less_tz) then
## TZ contains trailing DST string -- backup and remove it
cp $tzfile $tzfile\.old
sed s/^$tz/$dst_less_tz/ $tzfile > $tzfile\.new
cp $tzfile\.new $tzfile
set ntz = `grep '^TZ=' $tzfile`
echo "TZ changed from [$tz] to [$ntz] -- no longer observing DST"
else
echo "DST already removed [$tz] -- aborting"
endif
else
echo "Not last SUNDAY in OCTOBER -- cannot change DST"
endif
else
echo "Not a valid month [$mon] to change DST"
endif
else
echo "Location [$loc] is unsupported -- check $0 configurations"
exit(-1)
endif
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