Create an .iso file from .zip files, then burn those files to a CDROM using multi-session

cd_backup.sh

#!/bin/bash
# Created by Aaron, 12-29-2003
# This script is meant to create an .iso file from .zip files, then burn those files to a CDROM using multi-session
# Future upgrades: Research the use of a try/catch style function call so that a bad program can't hang the script indefinitely.

# Updated on 01-05-2004 to include support for multi-session CDROM burning
TRACK=`cdrecord -msinfo dev=ATAPI:0,1,0`
if ! [ $TRACK  ]
	then
# Track is null, therefore new CD, create standard ISO.	
		mkisofs -r -J -log-file ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log -o ~backup_audit/backup-log-`date +%m-%d-%y`.iso ~backup_audit/[Ss]ecurity*.zip
	else
# Track is NOT null, therefore create multisession ISO.
		mkisofs -r -J -C $TRACK -M /dev/cdrom -log-file ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log -o ~backup_audit/backup-log-`date +%m-%d-%y`.iso ~backup_audit/[Ss]ecurity*.zip

fi		

# Rudimentary error checking, if the ISO created, move forward and log, else error and log.
if [ -f ~backup_audit/backup-log-`date +%m-%d-%y`.iso ]
	then 
		echo "-----" >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log
		echo "ISO file created" >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log
		echo "-----" >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log
		cdrecord -multi dev=ATAPI:0,1,0 speed=10 -v ~backup_audit/backup-log-`date +%m-%d-%y`.iso >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log

# If the cdrecord returns a 0 error code, then it burned successfully, move the log files to a temporary holding location, log and exit.
		if [ $? = 0 ]
			then
				mv ~backup_audit/[Ss]ecurity*.zip ~backup_audit/burned_backup_logs
				rm -f ~backup_audit/backup-log-`date +%m-%d-%y`.iso
				echo "-----" >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log
				echo "Files successfully burned on `date +%m-%d-%y` at `date +%H:%M:%S`." >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log
			else
# More rudimentary error checking, if an error code was returned, it is likely that a fixated/closed disc was loaded in the drive, so log and exit.
				echo "An error occurred on `date +%m-%d-%y` at `date +%H:%M:%S`, files were not burned. Check that blank recordable media is present in the drive." >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log
		fi
	else
# If there was no ISO created, chances are that the files were not present, like on a weekend, or over a holiday, when they wouldn't normally send files. Therefore, it can exit gracefully on an error condition, very important for a script that is run as a cron job without any interaction.
		echo "An error occurred on `date +%m-%d-%y` at `date +%H:%M:%S`, log files were not present." >> ~backup_audit/logs/backup-log-`date +%m-%d-%y`.log
fi