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According to this page, one can let tar create a tar archive "split" into 100 Mb files:

tar -c -M --tape-length=102400 --file=disk1.tar largefile.tgz

The problem is that this command will require you to interactively give a new filename for the next file, after the first file is filled.

Anybody knows of a way to skip this interactive step, and let tar do the "splitting" automatically?

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migrated from serverfault.com May 31 '11 at 13:51

This question came from our site for system and network administrators.

up vote 17 down vote accepted

Take a look at the --new-volume-script option, which lets you replace the prompting mechanism with a different mechanism or with a generated filename. ((tar.info)Multi-Volume Archives in the tar info page.) The problem with split is that you need to cat the pieces back together to do anything, whereas a multivolume archive should be a bit more flexible.

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That's true, of course. – Eduardo I. May 31 '11 at 14:00
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Thanks, this is what I was looking for! I now found out that there is actually some instructions (incl. example) available here: gnu.org/software/tar/manual/tar.html#Using-Multiple-Tapes – Samuel Lampa Jun 1 '11 at 9:17

You can use split for this:

tar czpvf - /path/to/archive | split -d -b 100M - tardisk

This tells tar to send the data to stdout, and split to pick it from stdin - additionally using a numeric suffix (-d), a chunk size (-b) of 100M and using 'disk' as the base for the resulting filenames (tardisk00, tardisk01, etc.).

To extract the data afterwards you can use this:

cat tardisk* | tar xzpvf -
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Small correction, -d is for numeric suffix, not prefix. – yclian Dec 23 '14 at 13:16

Of course the best option to use is the --new-volume-script option.

But, if you know the size of the file (in this case, largefile.tgz), then you can do this also:

tar -c -M -L 102400 --file=disk1.tar --file=disk2.tar --file=disk3.tar largefile.tgz

Summary:

-c = Create
-M = multi-volume
-L 102400 = 100MB files (disk1.tar, disk2.tar, disk3.tar ...)

(For the -L, specify as many as needed so that the total sum of the tar files is larger than largefile.tgz)

If you are trying to tar a directory tree structure

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