Can a multi volume archive be manipulated in tar?
A multi-volume archive can be manipulated like any other archive (provided the ‘ –multi-volume ’ option is specified), but is stored on more than one tape or file. When you specify ‘ –multi-volume ’, tar does not report an error when it comes to the end of an archive volume (when reading), or the end of the media (when writing).
How do I create a new archive in tar?
The volume script can instruct tar to use new archive name, by writing in to file descriptor $TAR_FD (see below for an example). If the info script fails, tar exits; otherwise, it begins writing the next volume. If you want tar to cycle through a series of files or tape drives, there are three approaches to choose from.
How to read one volume of an archive?
You can read each individual volume of a multi-volume archive as if it were an archive by itself. For example, to list the contents of one volume, use ‘ –list ’, without ‘ –multi-volume ’ specified. To extract an archive member from one volume (assuming it is described that volume), use ‘ –extract ’, again without ‘ –multi-volume ’.
When does GNU tar ask to change the volume?
For example: or, which is equivalent: When GNU tar comes to the end of a storage media, it asks you to change the volume. The built-in prompt for POSIX locale is (26) : where n is the ordinal number of the volume to be created and archive is archive file or device name.
A multi-volume archive can be manipulated like any other archive (provided the –multi-volume (-M) option is specified), but is stored on more than one tape or disk. When you specify –multi-volume (-M), tar does not report an error when it comes to the end of an archive volume (when reading), or the end of the media (when writing).
How can I see the progress bar in tar?
When extracting with tar you can use the –checkpoint option. What you get is not really a progress bar but good enough to see the progress. In this example, tar will print a message each 100 records written.
Can you read all volumes of GNU tar?
Beware that there is no real standard about the proper way, for a tar archive, to span volume boundaries. If you have a multi-volume created by some vendor’s tar, there is almost no chance you could read all the volumes with GNU tar.