From: Paul Sheer <psheer@obsidian.co.za>
Subject: Mirrordir - backs up directories using a minimal set of changes
Date: Mon, 23 Feb 1998 11:51:58 GMT

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Mirrordir does a recursive copy from one directory to another, but only
copies files that have been modified since the last copy. It deletes files
in the target directory that don't exist in the source directory.

It is very useful for doing timed backups and, for example, taking your
work home with you on your laptop. We are currently going to implement
it in a server as an high-level-software alternative to a RAID device.

It mirrors every detail of the source tree. It exactly replicates device
files, symlinks, access and modication times, as well as permissions and
ownerships.

It optionally outputs a list of the changes needed to bring the two
directories to being identical.


Begin3
Title:          Mirrordir
Version:        0.9
Entered-date:   22FEB98
Description:    Mirrordir mirrors a directory tree in every detail,
                suitable for timed backups of disk drives.
                The minimal set of changes needed to make the
                original directory tree identical to the backup
                directory tree is executed. Mirrordir duplicates
                device/special files and file/directory access
                times exactly. Written in C with autoconf.
Keywords:       backup, mirror, copy, cp, mirrordir, recursive,
                directory trees
Author:         psheer@obsidian.co.za (Paul Sheer)
Maintained-by:  psheer@obsidian.co.za (Paul Sheer)
Primary-site:   sunsite.unc.edu /pub/Linux/system/backup
                48kB mirrordir-0.9.tar.gz
                1kB mirrordir.lsm
Platforms:      Any Unix
Copying-policy: GPL
End



Usage:
       mirrordir [--verbose [--verbose]] [--restore-access \
    [--access-times]] [[[--exclude <path>] --exclude <path>] ... ] \
                      [--nice <num>] <control> <mirror>
       mirrordir [--help | -h]

Makes two directory trees identical.

- --help                 Print out far more detailed help than this.
<control> <mirror>     Two almost identical directory trees.
- --verbose              Specifies verbose output of file modifications
                       made to <mirror>. Output is written to stderr.
- --only-read            Do not ever open the control files for writing.
- --restore-access       Restore the access times of <control> with each
                       read.
- --access-times         Duplicate even the access times of <control>.
- --exclude <path>       Assume file or directory <path> does not exist
                       in the directory tree <control>.
- --nice                 Be nice to CPU by sleeping occasionally. <num>
                       is a small integer.
- --test-only            Do not make any changes. If used with --verbose,
                       this will show what changes would be made. This
                       an effective way of comparing directory trees.
- --keep-files           Don't remove files unnecessarily from the
                       <mirror> directory if they don't exist in the
                       control directory. This makes mirrordir somewhat
                       like cp.






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