#!/bin/sh
#
# Backup the files $1, $2, ... to the ./OLD directory with appended
# date.
#
# Usage:	backup foo boo goo
#
#		Backup the files 'foo', 'boo', and 'goo' in the
#		./OLD directory.  Append the date and version suffix
#		to the base filename to handle multiple versions
#

FILES=$*

SUFFIXES="a b c d e f g h i j k l m n o p q r s t u v w x y"
END="z"
SUFFIXES=${SUFFIXES}" "$END

DATE=`date '+%m.%d.%y'`

if [ ! -d OLD ]; then
    echo "./OLD does not exist.  Making ./OLD now."
    mkdir OLD
    chmod 755 OLD
fi

for F in $FILES
do
    B="./OLD/$F.$DATE"
    if test -f $F
    then
	for S in $SUFFIXES
	do
	    if test -f ${B}$END
	    then
		echo "You have already created 27 backup versions for the same day."
		echo "I can't make any more for you."
		break
	    fi
	    if test -f ${B}$S
	    then
		continue
	    else
		echo "Copying $F to ${B}$S"
		cp $F ${B}$S
		break
	    fi
	done
    else
	echo "The file $F does not exist."
    fi
done