12-01-2005
gnu copy (as is on linux) has the -u option.
Also have a look at rsync
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LEARN ABOUT DEBIAN
librsync
librsync(3) Library Functions Manual librsync(3)
NAME
librsync - library for delta compression of streams
SYNOPSYS
#include <stdio.h>
#include <stdlib.h>
#include <librsync.h>
cc ... -lrsync
DESCRIPTION
The librsync library implements network delta-compression of streams and files. The algorithm is similar to that used in the rsync(1) and
xdelta(2) programs, but specialized for transfer of arbitrary-length octet streams. Unlike most diff programs, librsync does not require
access to both of the files on the same machine, but rather only a short ``signature'' of the old file and the complete contents of the new
file.
The canonical use of librsync is in the rproxy(8) reference implementation of the rsync proposed extension to HTTP. It may be useful to
other programs which wish to do delta-compression in HTTP, or within their own protocol. There are HTTP-specific utility functions within
librsync, but they need not be used.
A number of tools such as rdiff(1) provide command-line and scriptable access to rsync functions.
SEE ALSO
rdiff(1)
rdiff and librsync Manual
http://rproxy.sourceforge.net/.
draft-pool-rsync
BUGS
The rsync protocol is still evolving. There may be bugs in the implementation. The interface may change in the future, but it is becoming
more stable.
Many routines will panic in case of error rather than returning an error code to the caller. Patches to fix this are welcome, but at the
current state of development aborting seems as useful as trusting to possibly-incomplete checking in the client.
AUTHOR
Martin Pool <mbp@samba.org>, with Andrew Tridgell <tridge@samba.org>.
rdiff development has been supported by Linuxcare, Inc and VA Linux Systems.
Martin Pool $Date: 2003/06/12 06:03:32 $ librsync(3)