======Creating a dvd .iso from multiple .iso images======
This is helpful if you have 4 CD .isos (like an operating system distribution of CD 1 of 4, 2 of 4, 3 of 4, and 4 of 4) and you want just one .iso file on a single DVD disc for convenience purposes. \\

Create the separate .iso files and put them into 1 temporary directory by using:
<code>
dd if=/dev/cdrom of=filename.iso
</code>
check creation is okay with:
<code>
sum -r /dev/cdrom
sum -r <filename.iso>
</code>

Now copy [[http://juckins.net/sysadmin/scripts/make.dvdiso.bash.txt|make.dvdiso.bash]] into that directory, and call it like this (use the 'export' command if the script has .bash extension?):
<code>
export _POSIX2_VERSION=199209
./make.dvdiso /iso/dir/path output_image_name.iso
</code>
that creates the .iso file. \\
Now you can burn it to DVD using other software, such as Roxio, Nero, or Sonic.