Date: Mon, 1 Jul 1996 00:01:56 +1000 (EST) From: Julian Assange <proff@suburbia.net> To: freebsd-hackers@freebsd.org Subject: rsync Message-ID: <199606301401.AAA14509@suburbia.net>
next in thread | raw e-mail | index | archive | help
The below looks like a phenominally useful replacement for sup. According
to the tech report, total uncompressed transfer between two kernel trees
was around half the size of the *diffs*. It also streams data in both
directions, effectively removing rtt as an important consideration.
WHAT IS RSYNC?
--------------
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.
At first glance this may seem impossible because the calculation of
diffs between two files normally requires local access to both
files.
A technical report describing the rsync algorithm is included with
this package.
USAGE
-----
Basically you use rsync just like rcp, but rsync has many additional options.
Here is a brief description of available options:
-v, --verbose increase verbosity
-c, --checksum always checksum
-a, --archive archive mode (same as -rlptDog)
-r, --recursive recurse into directories
-b, --backup make backups (default ~ extension)
-u, --update update only (don't overwrite newer files)
-l, --links preserve soft links
-H, --hard-links preserve hard links
-p, --perms preserve permissions
-o, --owner preserve owner (root only)
-g, --group preserve group
-D, --devices preserve devices (root only)
-t, --times preserve times
-S, --sparse handle sparse files efficiently
-n, --dry-run show what would have been transferred
-x, --one-file-system don't cross filesystem boundaries
-B, --block-size SIZE checksum blocking size
-e, --rsh COMMAND specify rsh replacement
--rsync-path PATH specify path to rsync on the remote machine
-C, --cvs-exclude auto ignore files in the same way CVS does
--delete delete files that don't exist on the sending side
-I, --ignore-times don't exclude files that match length and time
--exclude FILE exclude file FILE
--exclude-from FILE exclude files listed in FILE
--suffix SUFFIX override backup suffix
--csum-length LENGTH set the checksum length
--version print version number
SETUP
-----
Rsync uses rsh or ssh for communication. It does not need to be setuid
and requires no special privilages for installation. It does not
require a inetd entry or a daemon. You must, however, have a working
rsh or ssh system. Using ssh is recommended for its security and
compression features.
To install rsync, first run the "configure" script. This will create a
Makefile and config.h appropriate for your system. Then type
"make".
Once built put a copy of rsync in your search path on the local and
remote systems (or use "make install"). That's it!
COPYRIGHT
---------
Rsync was written by Andrew Tridgell and Paul Mackerras, and is
available under the GPL.
Andrew.Tridgell@anu.edu.au
paulus@cs.anu.edu.au
AVAILABILITY
------------
The main ftp site for rsync is ftp://samba.anu.edu.au/pub/rsync
--
"Of all tyrannies a tyranny sincerely exercised for the good of its victims
may be the most oppressive. It may be better to live under robber barons
than under omnipotent moral busybodies, The robber baron's cruelty may
sometimes sleep, his cupidity may at some point be satiated; but those who
torment us for own good will torment us without end, for they do so with
the approval of their own conscience." - C.S. Lewis, _God in the Dock_
+---------------------+--------------------+----------------------------------+
|Julian Assange RSO | PO Box 2031 BARKER | Secret Analytic Guy Union |
|proff@suburbia.net | VIC 3122 AUSTRALIA | finger for PGP key hash ID = |
|proff@gnu.ai.mit.edu | FAX +61-3-98199066 | 0619737CCC143F6DEA73E27378933690 |
+---------------------+--------------------+----------------------------------+
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199606301401.AAA14509>