Listing 5: A simple backup script

#!/bin/sh
# Don't forget to set these!
#
# Host with tape drive. You can run this script on a
# different host than the one with the tape drive as
# long as you have rsh access to all systems without
# having to provide the password.
#
TAPEHOST=
#
# Change device to use if not st0. Also check alternate
# (tape2); default is st1.
#
DEVICE=nrst0
#
# The following variables are set to correct parameters
# for a 8mm 5GB tape
# OPTIONS: dump options; BT: blocking factor;
# SIZE: length of tape; DENSITY: tape density
#
# For a 2BG tape drive use SIZE=6000
#
OPTIONS=ubsdf
BT=126
SIZE=12000
DENSITY=54000
#
# The following are for a 150MB 1/4" tape drive
# OPTIONS: dump options; BT: number of tracks;
# SIZE: length of tape; DENSITY: tape density
#
#OPTIONS=uctsdf
#BT=18
#SIZE=700
#DENSITY=6250
#
# Path to dump command on remote machine - location on
# your systems may be different.
#
DUMP=/etc/rdump
#
#check parameters
if [ $# -lt 2 ]; then
echo "Usage: $0 <level> <Day> [tape2] [rew]
Where <level> is the level of the dump that you want
(0-9).
<Day>   is the type of dump, corresponding
to the day of the week for nightly
incrementals. It may be one of:
Monday Tuesday Wednesday Thursday
Weekly Monthly
[tape2]  is an optional parameter that directs
the script to use the alternate tape
drive instead of the primary drive.
and   [rew]   is an optional parameter that indicates
the tape should remain rewound. This
parameter is significant only on
incrementals, where the default is go
to the end of the tape."
exit 1
fi
LEVEL=$1
DAY=$2
#
# The following variable is used only on daily backups.
# Override for new tapes and Monday, or change the
# script so Monday's daily stays rewound by default.
#
EOM=yes
#
# Example setup and usage with a backup account.
# Uncomment the following line.
#USER=backup
#
# Replace the second line of the dump command with the
# following 2 lines.
#$SIZE $DENSITY ${USER}@${TAPEHOST}:/dev/${DEVICE} $FS
#
# Parse command line looking for optional parameters
for i
do case $i in
rew)
EOM=no;;
tape2)
DEVICE=nrst1
# if the secondary drive is on a different system
# uncomment and set the following line.
#       TAPEHOST=
#
# if the secondary tape drive is a 1/4" tape uncomment
# the following lines
#       OPTIONS=uctsdf
#       BT=18
#       SIZE=700
#       DENSITY=6250
;;
esac
done
date
echo Rewinding
/usr/ucb/rsh $TAPEHOST mt -f /dev/${DEVICE} rew
echo $DAY Backup on $TAPEHOST
#
if [ $DAY = Monthly ]; then
echo Monthly backup
#
# List hosts to backup on next line. For example:
# for HOST in pegasus mikey
#
for HOST in
do
#
# List file systems to dump on the next line. For
# example: for FS in /dev/sd0a /home)
#
for FS in
do

echo ${HOST}:${FS} to $DEVICE on $TAPEHOST
/usr/ucb/rsh $HOST $DUMP ${LEVEL}${OPTIONS} $BT \
$SIZE $DENSITY ${TAPEHOST}:/dev/${DEVICE} $FS
done
done
elif [ $DAY = Weekly ]; then
echo Weekly backup
#
# Set name of host to backup, or convert to list of
# hosts with "for HOST in" statement, but don't forget
# to add the "do..done".
#
HOST=
#
# Set file system to back up, or convert to "for FS in"
# statement, but don't forget to add the "do..done".
#
FS=
echo ${HOST}:${FS} to $DEVICE on $TAPEHOST
/usr/ucb/rsh $HOST $DUMP ${LEVEL}${OPTIONS} $BT \
$SIZE $DENSITY ${TAPEHOST}:/dev/${DEVICE} $FS
else
echo Daily backup
if [ $EOM = yes ] ; then
# Put this incremental at the end of the tape.
echo Going to end of media
/usr/ucb/rsh $TAPEHOST mt -f /dev/${DEVICE} eom
fi
#
# Set name of host to backup, or convert to list of
# hosts with "for HOST in" statement, but don't forget
# to add the"do..done".
#
HOST=
#
# Set file system to back up, or convert to "for FS in"
# statement, but don't forget to add the "do..done".
#
FS=
#
echo ${HOST}:${FS} to $DEVICE on $TAPEHOST
/usr/ucb/rsh $HOST $DUMP ${LEVEL}${OPTIONS} $BT \
$SIZE $DENSITY ${TAPEHOST}:/dev/${DEVICE} $FS
fi
#
# Multiple Dailys go on one tape, so rewind after the
# dump but don't offline. This makes sure that the dump
# always starts at a known point (i.e. rewound).
# Offline at end of week and on Weeklys and Monthlys to
# prevent accidentally overwriting the dump.
#
if [ $DAY = Monday -o $DAY = Tuesday -o \
$DAY = Wednesday ]; then
echo Rewinding
/usr/ucb/rsh $TAPEHOST mt -f /dev/${DEVICE} rew
else
echo Rewinding and going offline
/usr/ucb/rsh $TAPEHOST mt -f /dev/${DEVICE} offline
fi
#
date