UNIX for Advanced & Expert Users

#!/usr/bin/ksh                                      
DATE=`date +"%y%m%d%H%M"`                           
echo $DATE                                          
FILENAME=`echo "obase = 16\n $DATE"|bc`             
echo $FILENAME                                      
cd /                                                
tar ctvf /home/$FILENAME.tar u >/dev/null           
cd /home                                            
gzip $FILENAME.tar                                  
mv $FILENAME.tar.gz $FILENAME.tgz                   
POSITION=`cdrecord -msinfo`                         
echo $POSITION                                      
mkisofs -o $FILENAME.iso -C $POSITION $FILENAME.tgz 
cdrecord -sao -multi $FILENAME.iso

cdrecord -msinfo

       -multi Allow  multi  session CDs or multi border DVDs to be made.  This
              flag needs to be present on all sessions of a multi  session  or
              multi  border  disk, except you want to create a session on a CD
              that will be the last session on the CD media.

              For CD media, the fixation will be done in a way that allows the
              CD/DVD/BluRay-Recorder to append additional sessions later. This
              is done by generation a TOC with a  link  to  the  next  program
              area.  The so generated media is not 100% compatible to manufac-
              tured CDs (except for CDplus).  Use only for recording of  multi
              session  CDs.  If this option is present, the default track type
              is CD-ROM XA mode 2 form 1 and the sector size  is  2048  bytes.
              The XA sector subheaders will be created by the drive.  The Sony
              drives have no hardware support for CD-ROM XA  mode  2  form  1.
              You  have  to  specify the -data option in order to create multi
              session disks on these drives.  If you like to record  a  multi-
              session  disk  in  SAO mode, you need to force CD-ROM sectors by
              including the -data option.  Not all drives  allow  multisession
              CDs in SAO mode.

              For  DVD  media,  -multi  switches the write mode to incremental
              packet recording.  There is currently  no  way  to  prevent  the
              ability  to  append further sessions and there is currently only
              support for DVD-R/DVD-RW media.  To reuse a DVD-RW that has pre-
              viously  been  written  in incremental packet recording mode for
              different write modes,  you  need  to  blank  the  entire  media
              before.

# Burn the first session
growisofs -Z /dev/dvd -R -J backup1.tar.gz
# Burn on another session
growisofs -M /dev/dvd -R -J backup2.tar.gz