Rsync

rsync is a file synchronization and file transfer program for Unix-like systems that minimizes network data transfer by using a form of delta encoding called the rsync algorithm. rsync can compress the data transferred further using zlib compression, and SSH or stunnel can be used to encrypt the transfer. rsync is typically used to synchronize fil...
Found on http://en.wikipedia.org/wiki/Rsync

rsync

Synchronize two directories, see Section 9.3.
Found on http://www.tldp.org/LDP/intro-linux/html/gloss.html
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