#!/bin/csh -f
#
#	Set file's timestamp to 4 hours ago.
#	(Based totally on touch-24.)
#
#	Written for MacOSX.
#	(Does not work on Solaris-10, where
#	date does not support "+%s" or "-r".)
#
#	Brent Chivers					2010 Jun 29
#
#	Re-written for Linux.				2011/Jan/08
#	Requires my date_name4 binary.

unalias *			# get other users' .cshrc stuff out of the way
 
# set seconds = `date '+%s'`		# seconds since the epoch
# @ yesterday = $seconds - 14400	# seconds 4 hours earlier (4 * 60 * 60)
# set date = `date -r $yesterday '+%Y%m%d%H%M.%S'`	# convert seconds to touch string
# touch -t $date $*			# touch all files with yesterday's date/time

set mmss = `/bin/date '+%M.%S'`		# minutes and seconds
set hh = `/bin/date '+%k'`		# hour
if ("$hh" > 3) then			# 4 hours earlier is still today.
	set yyyymmdd = `/home/bchivers/bin/date_name4 = | /usr/bin/tr -d =`
	@ hh = $hh - 4			# 4 hours earlier
	if ("$hh" < 10) then
	    	set hh = "0$hh"		# pad single digit with leading zero
	    endif
    else				# 4 hours earlier is yesterday.
	set yyyymmdd = `/home/bchivers/bin/date_name4 = -1 | /usr/bin/tr -d =`
	@ hh = $hh + 20			# 4 hours earlier
    endif
		   
/usr/bin/touch -t $yyyymmdd$hh$mmss $*