# aptitude install jigdo-file
% jigdo-lite

Jigsaw Download "lite"
Copyright (C) 2001-2004  |  jigdo@
Richard Atterer          |  atterer.net
Getting mirror information from /etc/apt/sources.list

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To resume a half-finished download, enter name of .jigdo file.
To start a new download, enter URL of .jigdo file.
You can also enter several URLs/filenames, separated with spaces,
or enumerate in {}, e.g. `http://server/cd-{1_NONUS,2,3}.jigdo'
jigdo: http://cdimage.debian.org/debian-cd/3.1_r1/i386/jigdo-cd/debian-31r1-i386-binary-1.jigdo

Downloading .jigdo file

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Images offered by `http://cdimage.debian.org/debian-cd/3.1_r1/i386/jigdo-cd/debian-31r1-i386-binary-1.jigdo':
  1: 'Debian GNU/Linux 3.1 r1 "Sarge" - Official i386 Binary-1 CD' (debian-31r1-i386-binary-1.iso)

Further information about `debian-31r1-i386-binary-1.iso':
Generated on Tue, 20 Dec 2005 00:33:52 +0100

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If you already have a previous version of the CD you are
downloading, jigdo can re-use files on the old CD that are also
present in the new image, and you do not need to download them
again. Mount the old CD ROM and enter the path it is mounted under
(e.g. `/mnt/cdrom').
Alternatively, just press enter if you want to start downloading
the remaining files.
Files to scan:

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The jigdo file refers to files stored on Debian mirrors. Please
choose a Debian mirror as follows: Either enter a complete URL
pointing to a mirror (in the form
`ftp://ftp.debian.org/debian/'), or enter any regular expression
for searching through the list of mirrors: Try a two-letter
country code such as `de', or a country name like `United
States', or a server name like `sunsite'.
Debian mirror [http://ftp.ring.gr.jp/pub/linux/debian/debian-ddtp/]:

Downloading .template file

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Merging parts from `file:' URIs, if any...
Found 0 of the 1190 files required by the template
Will not create image or temporary file - try again with different input files

Found 1 of the 1 files required by the template
Successfully created `debian-31r1-i386-binary-1.iso'

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Finished!
The fact that you got this far is a strong indication that `debian-31r1-i386-binary-1.iso'
was generated correctly. I will perform an additional, final check,
which you can interrupt safely with Ctrl-C if you do not want to wait.

OK: Checksums match, image is good!