hi,
How can i split an ISO image?How can i combine them?
I want to burn some systemfiles or i want to take backup of linux into cd's
if the size of the total files is more than size that a cd can then i want to split that ISO image.How to split this ISO image.again when i restoring the files from cd's how can i recombine the files?

you can use split or dd.
i've used this many times to split tar backups into files.
tar clfvpz - . |split --bytes 650m - /1/hda$p.tgz-

to recombine them, use what you wish. with cat, you could cat file1 file2 file3 > whole.file

with dd to split the files, you could use skip.
dd if=bigfile of=file1 count=650 bs=1M
dd if=bigfile skip=650 of=file2 count=650 bs=1M
dd if=bigfile skip=1300 of=file3 count=650 bs=1M
and so on
recombine with cat or whatever you wish.


edit: sorry i copied that first command from a script without really looking at it first. i fixed it. you can change the tar part to a cat and the file you wish to split up for what you want to do.

This may take forever but using rar to break up the hd image into smaller pieces and adding redunancy with par or par2 may better in case part of a cd gets scratched.

i don't need to take total backup of harddisk.whatever the files or directories that i want to take backu i will just select them in gui program.after that all the paths that are needed to take backup will be added to one file backup.txt after that i will make an iso image with all the files in backup.txt .In this if size is more than 650 mb it should split it and then burn the first image.like that