下面提供了一个简单的脚本文件来作为一个同时实现完全和差分备份的自动化模型。在使用该脚本以前，请注意检查脚本头定义的环境变量以满足自己的需要。

#!/bin/sh

#

#######################################

#

# TAR backup script to cover daily and weekly backups on one tape.

# Generic UNIX version - edit variables as required

#

# For this to work, it MUST be started on a Monday!

#

# Copyright (c) 1999, Tim Jones

# Permission granted for use/modification

#

# Tim Jones/Linux Magazine provide this shell script with no warranty

# (implied or otherwise)

#

########################################

DOW=`date +%w`

DATE=`date +%D`

DAY=`date +%A`

DEVICE="MY REWIND TAPE" # Rewinding tape drive

NDEVICE="MY NO_REWIND TAPE" # non-rewinding tape drive

REWIND="mt -f $DEVICE rewind"

EOD="mt -f $NDEVICE eod"

FSF="mt -f $NDEVICE fsf"

MAILLIST="root" # list of users to receive backup notice

if [ $DOW = "6" ]

then

# This is Saturday, so append and write the whole system!

$EOD

echo $DATE > /tmp/.LASTFULL

tar -cvvf $NDEVICE / >/tmp/backup.txt

$REWIND

$FSF 5

tar -dvf $NDEVICE >> /tmp/backup.txt

$REWIND

cp /tmp/.LASTFULL /etc/.LASTFULL

else

# this is not Saturday

case $DOW in

0)

# it's Sunday - nothing to do

exit 0

;;

1)

# Monday, Let the tape rewind for the difference verification

echo $DATE > /tmp/.LASTINC

tar -cvvf $DEVICE --newer `cat /etc/.LASTFULL` / >/tmp/backup.txt

cp /tmp/.LASTINC /etc/.LASTINC

;;

*)

# Other Days, must rewind manually and Inspect, -i

$EOD

echo $DATE >/tmp/.LASTINC

tar -cvvf $NDEVICE --newer `cat /etc/.LASTINC` / >/tmp/backup

$REWIND

$FSF `expr $DOW - 1`

echo "************ Verifying ${DAY}'s backup" >> /tmp/backup.txt

tar --dvf $NDEVICE >> /tmp/backup.txt

cp /tmp/.LASTINC /etc/.LASTINC

$REWIND

esac

fi

mail $MAILLIST < /tmp/backup.txt

rm -f /tmp/backup.txt

# END OF SCRIPT