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Why to concatenate into tarballs when compressing?

Scifer
Scifer Posts: 8
in Getting Started with Linux

I couldn't find the exact reasons for concatenate files into a tarball while compressing. Could it be speed, redundancy or just for the sake of sequential I/O devices? I'd like to know if the other programs like zip, rar and 7zip do the same process silently. And what would be the consequences for compressing with gz and bz2 without concatenating, if it's possible.

Comments

  • saqman2060
    saqman2060 Posts: 777
    If I am correct, "Concatenating" means group together as one. Perhaps this makes it easier to compress the files when they are in a single location, something like speeding up access time. Experiment and try to compress the files without concatenating. Make sure you pay close attention to the differences.
  • woboyle
    woboyle Posts: 501
    When you "concatenate" a set of files into a tarball, you get all the substructure when you expand the tarball at a later time, including symbolic links. This makes for a good archival copy of a file/directory set. Compressing the tarball just makes it more compact so it takes up less disc space than the original set until expanded and untarred.
  • Scifer
    Scifer Posts: 8
    woboyle wrote:
    When you "concatenate" a set of files into a tarball, you get all the substructure when you expand the tarball at a later time, including symbolic links.
    What are the other features of this substructure?
  • saqman2060
    saqman2060 Posts: 777
    Yes, what are the contents of the substructure?

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