dds2index(1) tool to create an indexfile for the use of


dds2index [options]


dds2index creates an index file that is required by the file extraction utility dds2tar(1). It works on tar archives stored on dds tape devices (DAT). Since the file structure of the tape archives is used to extract the files, the archive must be an uncompressed tar archive. But compression by the transparent signal processor of the tape device is allowed.

The index created by dds2index is written to stdout by default and should normally be stored on hard disk as indexfile for later use by dds2tar(1).

The default tape device to read from is /dev/nst0, which may be overridden with the environment variable TAPE, which in turn may be overridden with the -f device option. The device must be a SCSI tape device.


-f devicefile
device of the tape archive. Must be a character special file.
-t indexfile
write the index to indexfile, not to stdout.
write the index in (gzip) compressed mode.
print some screens of online help with examples through a pager and exit immediatley.

OPTIONS you didn't really need

-b, --block-size
Set the maximal blocksize, dds2index can handle.
--z, --no-compress
Don't filter the archive file through gzip.
verbose mode. Print to stderr what is going on.
Print a hash sign '#' to stderr for each MB read from tape.
Print the version number of dds2index to stderr and exit immediately.


Example of getting the index from the default tape /dev/nst0 and storing it in file archive.idx:
dds2index -v -t archive.idx


This program can only read records (tar is calling them tape blocks) up to 32 kbytes. A bigger buffer will cause problems with the Linux device driver.


The environment variable TAPE overrides the default tape device /dev/nst0.


default tape device file. Must be a character special file.


This program was created as a tool for dds2tar(1).


J"org Weule ([email protected]), Phone +49 211 751409. This software is available at