#!/bin/sh
#
# $RCSfile$
# $Revision: 2429 $
# $Date: 2005-02-06 17:51:21 -0500 (Sun, 06 Feb 2005) $
# $Author: gtf $
# $Locker$
#
# NOTE: This file comes from /usr/src/cs/age on cs-sun-fsa.cpsc.ucalgary.ca
#

PATH=/usr/ucb:/usr/bin:/bin
export PATH
trap '  echo 1>&2 "$0: Interrupt!"; exit 15' 1 2 3 15
if [ $# -lt 2 -o $# -gt 3 ]; then
	echo 1>&2 "Usage: $0 logfile keep [ dir ]"
	exit 1
fi
log=$1
max=$2
if [ $# != 3 ]; then
	dir=`expr $log : '\(.*\)/.*'`
	if [ -z "$dir" ]; then dir="."; fi
else
	dir=$3;
fi
if [ ! -d $dir ]; then
	echo 1>&2 "$0: $dir: Not a directory"
	exit 1
fi
if [ ! -f $log ]; then
	echo 1>&2 "$0: $log: No such file or directory"
	exit 1
fi
tmp="${dir}/`basename $log`"
old=`expr $max - 1`
if [ $? -eq 2 ]; then
	echo 1>&2 "$0: $max: Not an integer"
	exit 1
fi
if [ $max -gt 0 ]; then
	while [ $old -ge 0 ]; do
		new=`expr $old - 1`
		if [ $old -gt 0 ]; then
			if [ -f $tmp.$new ]; then
				mv $tmp.$new $tmp.$old
			fi
		else
			cp -p $log $tmp.$old
		fi
		old=$new
	done
fi
cp /dev/null $log
exit 0