synchronizing part of a file

jw schultz jw at
Tue Oct 15 22:10:00 EST 2002

On Tue, Oct 15, 2002 at 12:20:30PM +0100, rolf.hausammann at wrote:
> Hi all,
> I would like to synchronize a part of the source file with a part of the
> destination file. In detail I would like to
>    -  synchronize a file on a remote host from line "n" onwards with the
> file content on the local host starting with line "n" in the file.
>    - the firs "n" lines of the files on the local and remote host should
> not be changed.
> My questions are:
>   1)   Is it possible to do this with rsync?
>   2)   Has anyone done that before?
>   3)   How can I do this/where can I get more information?

1) not without lots of surrounding logic.
2) it hasn't been reported on the 6 o'clock news.
3) too many ways and places to list.

I'd start by reexamining the problem.  Rsync is for
syncronizing directory trees and incendentally files.
Only syncronizing part of a file is a very unusual
requirement.  In most cases when a very unusual requirement
appears (like this one) it is because the available options
haven't been explored.

This sounds like a config file, most config file formats
support something like an #include directive so you can
seperate local from global.  The same holds true for
scripting languages.

More than one person has suggested doing cut; rsync; cat
If it does come to that it might be better to only cut once.
Keep it as two seperate files and cat them together into a
third after each rsync.  But first explore the possibility
of having whatever uses the file read from to files instead
of the one; that would be less fragile.

	J.W. Schultz            Pegasystems Technologies
	email address:		jw at

		Remember Cernan and Schmitt

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