See jigdo-file(1) for an introduction to Jigsaw Download.
Given the URL of a `.jigdo' file, jigdo-lite downloads the large file (e.g. a CD image) that has been made available through that URL. wget(1) is used to download the necessary pieces of administrative data (contained in the `.jigdo' file and a corresponding `.template' file) as well as the many pieces that the large file is made from. The jigdo-file(1) utility is used to reconstruct the large file from the pieces.
`.jigdo' files that contain references to Debian mirrors are treated specially: When such a file is recognized, you are asked to select one mirror out of a list of all Debian mirrors.
If URL is not given on the command line, the script prompts for a location to download the `.jigdo' file from.
jigdo-file(1), jigdo-mirror(1), wget(1) (or `info wget')
CD images for Debian Linux can be downloaded with jigdo.
Jigsaw Download was written by Richard Atterer <jigdo atterer.net>, to make downloading of
CD ROM images for the Debian Linux distribution more convenient.