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zsync is a file transfer program similar to rsync. zsync is optimized for distribution of files across Internet, with one file on a server to be distributed to thousands of downloaders.

To install zsync in Ubuntu, just paste this in a terminal:
sudo apt-get install zsync

We can use this to update our Karmic ISO to the latest version. For instance, if you have previously downloaded Ubuntu Karmic Koala Alpha 6 ISO, you can run the following command:
zsync -i karmic-desktop-i386.iso http://releases.ubuntu.com/karmic/ubuntu-9.10-beta-desktop-i386.iso.zsync

This will basically read your karmic-desktop-i386.iso from the hard disk and compare it to the ubuntu-9.10-beta-desktop-i386.iso file from the Ubuntu download server and update your local image with the new version.

[via unix lab]