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... continued (sorry my fingers are too big for this keyboard...)
For example to backup a big archive .tar.gz (> 10Go) into several chunks that could be burned on DVDs ?
The other solution for me would be to specify the chunks sizes before creating the archive, I have a folder containing several thousands of files that I compress using a "tar -czvf command". Can I at this time specify that I want several archive files of given sizes ?
You could try DAR (see my sig) which allows you to perform a compressed backup (using gzip or bzip2 algorithms) splitted in several files with sizes of your choice. It also has many other handy features, even a backup manager.
I told you in the other related thread. To get good and quick answers, you must make good questions. I am not blaming you, just telling we have not learned to read minds. You should explain the problem and what you want precisely.
Now you know you can split files with the 'split' command. Just read 'man split' to know how to use it. Then you save your and our time.
To join all:
1 - Enter 1st dvd
2 - Copy the file, ie: /my_big_file.tar.gz
3 - Enter next dvd
4 - cat /media/dvd/my_big_file.* >> /my_big_file.tar.gz
5 - goto 3
The >> appends to the end of the file. > overwrites.