#! /bin/sh
# checkback day-of-week month-of year day-of-month year Week-of-year
#
echo "$1" "$2" "$3" | cat - /etc/backup.control | \
awk '{
BEGIN	{
}
NR == 1	{
	dow = 0
	if ($1 ~= '[Ss][Uu][Nn]') dow = 1
	if ($1 ~= '[Mm][Oo][Nn]') dow = 2
	if ($1 ~= '[Tt][Uu][Ee]') dow = 3
	if ($1 ~= '[Ww][Ee][Dd]') dow = 4
	if ($1 ~= '[Tt][Hh][Uu]') dow = 5
	if ($1 ~= '[Ff][Rr][Ii]') dow = 6
	if ($1 ~= '[Ss][Aa][Tt]') dow = 7
	if (dow == 0) {
		print $i ": day of week must be one of Sun, Mon, Tue, Wed, Thu, Fri, Sat."
		exit
	}
	# check/generate other values
	next
}
/^cyclelen/	{
	# set cyclelen
}
/^\/dev\//	{ 
	# store lines for this day of the week
}'