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+rsync is a replacement for rcp that has many more features.
+
+rsyns 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.
+This makes rsync a good remote file distribution/synchronisation utility
+in a dialup PPP/SLIP environment.
+
+Note: it requires rsync on the destination machine.
+
+There is a Computer Science Technical Report on the rsync algorithm
+included in the distribution, and is also available as
+ ftp://samba.anu.edu.au/pub/rsync/tech_report.ps