быстрый, универсальный, удаленный (и локальный) инструмент для копирования файлов (a fast, versatile, remote (and local) file-copying tool)
Описание (Description)
Rsync is a fast and extraordinarily versatile file copying tool.
It can copy locally, to/from another host over any remote shell,
or to/from a remote rsync daemon. It offers a large number of
options that control every aspect of its behavior and permit very
flexible specification of the set of files to be copied. It is
famous for its delta-transfer algorithm, which reduces the amount
of data sent over the network by sending only the differences
between the source files and the existing files in the
destination. Rsync is widely used for backups and mirroring and
as an improved copy command for everyday use.
Rsync finds files that need to be transferred using a "quick
check" algorithm (by default) that looks for files that have
changed in size or in last-modified time. Any changes in the
other preserved attributes (as requested by options) are made on
the destination file directly when the quick check indicates that
the file's data does not need to be updated.
Some of the additional features of rsync are:
o support for copying links, devices, owners, groups, and
permissions
o exclude and exclude-from options similar to GNU tar
o a CVS exclude mode for ignoring the same files that CVS
would ignore
o can use any transparent remote shell, including ssh or rsh
o does not require super-user privileges
o pipelining of file transfers to minimize latency costs
o support for anonymous or authenticated rsync daemons
(ideal for mirroring)
