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   rsync 3.2.7 (remote file sync)

   rsync is a replacement for rcp that has many more features. It
   uses the "rsync algorithm" which provides a very fast method for
   bringing remote files into sync. It does this by sending just the
   differences in the files across the link, without requiring that
   both sets of files are present at one of the ends of the link
   beforehand.

   Homepage: https://rsync.samba.org/

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