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Zsync
Jul 20, 2023
File transfer program
zsync is a file transfer program. It allows you to download a file from a remote web server, where you have a copy of an older version of the file on your computer already. zsync downloads only the new parts of the file. It uses the same algorithm as rsync.
zsync does not require any special server software or a shell account on the remote system rsync, in comparison, requires that you have an rsh or ssh account, or that the remote system runs rsyncd. Instead, it uses a control file - a .zsync file - that describes the file to be downloaded and enables zsync to work out which blocks it needs. This file can be created by the admin of the web server hosting the download, and placed alongside the file to download - it is generated once, then any downloaders with zsync can use it. Alternatively, anyone can download the file, make a .zsync and provide it to other users this is what I am doing for the moment.
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