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Document -J, --omit-link-times and remove a confusing sentence from
the -O, --omit-dir-times description.
OK tb@

.\"	$OpenBSD: rsync.1,v 1.35 2023/11/27 11:32:34 claudio Exp $
.\"
.\" Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: November 27 2023 $
.Dt OPENRSYNC 1
.Os
.Sh NAME
.Nm openrsync
.Nd synchronise local and remote files
.Sh SYNOPSIS
.Nm openrsync
.Op Fl aDgIJlnOoprtVvx
.Op Fl e Ar program
.Op Fl -address Ns = Ns Ar sourceaddr
.Op Fl -compare-dest Ns = Ns Ar directory
.Op Fl -contimeout Ns = Ns Ar seconds
.Op Fl -del
.Op Fl -exclude Ar pattern
.Op Fl -exclude-from Ns = Ns Ar file
.Op Fl -include Ar pattern
.Op Fl -include-from Ns = Ns Ar file
.Op Fl -max-size Ns = Ns size
.Op Fl -min-size Ns = Ns size
.Op Fl -no-motd
.Op Fl -numeric-ids
.Op Fl -port Ns = Ns Ar service
.Op Fl -rsync-path Ns = Ns Ar program
.Op Fl -size-only
.Op Fl -timeout Ns = Ns Ar seconds
.Ar source ...
.Ar directory
.Sh DESCRIPTION
The
.Nm
utility synchronises files in the destination
.Ar directory
with one or more
.Ar source
files.
Either the
.Ar source
or the destination
.Ar directory
may be remote,
but not both.
The arguments are as follows:
.Bl -tag -width Ds
.It Fl a , -archive
Shorthand for
.Fl Dgloprt .
.It Fl -address Ns = Ns Ar sourceaddr
When connecting to an rsync daemon, use
.Ar sourceaddr
as the source address for connections, which is useful on machines with
multiple interfaces.
.It Fl -compare-dest Ns = Ns Ar directory
Use directory as an alternate base directory to compare files against on the
destination machine.
If file in
.Ar directory
is found and identical to the sender's file, the file will not be transferred.
Multiple
.Fl -compare-dest
directories may be provided.
If
.Ar directory
is a relative path, it is relative to the destination directory.
.It Fl -contimeout Ns = Ns Ar seconds
Set the connection timeout in seconds.
Exit if no connection established within the specified time.
The default is 0, which means no timeout.
.It Fl D
Also transfer device and special files.
Shorthand for
.Fl -devices -specials .
.It Fl -del , -delete
Delete files in
.Ar directory
not found in
.Ar source
directories.
Only applicable with
.Fl r .
.It Fl e Ar program , Fl -rsh Ns = Ns Ar program
Specify alternative communication program, defaults to
.Xr ssh 1 .
.It Fl -exclude Ar pattern
Exclude files matching
.Em pattern .
.It Fl -exclude-from Ns = Ns Ar file
Load
.Em patterns
and
.Em rules
from
.Em file .
.It Fl -devices
Also transfer device files.
.It Fl g , -group
Set the group name to match the source.
For example, group
.Qq kristaps
with ID 1000 on a remote server is matched to group
.Qq kristaps
on the local machine with ID 2000.
If
.Fl -numeric-ids
is also given or if the remote group name is unknown on the local machine,
set the numeric group ID to match the source instead.
.It Fl I , -ignore-times
Do not skip based on file size and modification time.
.It Fl -include Ar pattern
Include files matching
.Em pattern .
.It Fl -include-from Ns = Ns Ar file
Load
.Em patterns
and
.Em rules
from
.Em file .
.It Fl J , -omit-link-times
Don't set symlink modification times to match the source.
.It Fl l , -links
Also transfer symbolic links.
The link is transferred as a standalone file: if the destination does
not exist, it will be broken.
.It Fl -max-size Ar size
Don't transfer any file that is larger than
.Ar size
bytes.
Alternatively
.Ar size
may instead use a multiplier, as documented in
.Xr scan_scaled 3 ,
to specify the size.
.It Fl -min-size Ar size
Don't transfer any file that is smaller than
.Ar size
bytes.
See
.Fl -max-size
on the definition of size.
.It Fl n , -dry-run
Do not actually modify the destination.
Mainly useful in combination with
.Fl v .
.It Fl -no-motd
Do not display the Message of the Day.
.It Fl -numeric-ids
Ignore user and group names, use numeric user and group IDs only.
Has no effect unless
.Fl g
or
.Fl o
is also given.
.It Fl O , -omit-dir-times
Don't set directory modification times to match the source.
.It Fl o , -owner
Set the user name to match the source, with similar matching logic as for
.Fl g .
If
.Fl -numeric-ids
is also given or if the remote user name is unknown on the local machine,
set the numeric user ID to match the source instead.
Only works if run as root.
.It Fl p , -perms
Set destination file or directory permissions to match the source when
it is updated.
.It Fl -port Ns = Ns Ar service
Specify an alternative TCP port number.
The
.Ar service
can be given as a decimal integer or as a name to be looked up in the
.Xr services 5
database.
The default is
.Dq rsync .
.It Fl r , -recursive
If
.Ar source
designates a directory, synchronise the directory and the entire subtree
connected at that point.
If
.Ar source
ends with a slash, only the subtree is synchronised, not the
.Ar source
directory itself.
If
.Ar source
is a file, this has no effect.
.It Fl -rsync-path Ns = Ns Ar program
Run
.Ar program
on the remote host instead of the default
.Pa rsync .
.It Fl -size-only
Skip files based only on size, don't check timestamp.
.It Fl -specials
Also transfer fifo and unix domain socket files.
.It Fl -timeout Ns = Ns Ar seconds
Set the I/O timeout in seconds.
Exit if no data was transferred for the specified time.
The default is 0, which means no timeout.
.It Fl t , -times
Set destination file and directory modification time to match the source
when it is updated or created.
.It Fl V , -version
Print version and exit.
.It Fl v , -verbose
Increase verbosity.
Specify once for files being transferred, twice for specific status,
thrice for per-file transfer information, and four times for per-file
breakdowns.
.It Fl x
Do not cross filesystem boundaries.
If this option is repeated, all mount point directories from the copy are
omitted.
Otherwise, it includes an empty directory at each mount point it encounters.
.El
.Pp
A remote
.Ar source
or
.Ar directory
has the syntax
.Ar host : Ns Ar path
for connecting via
.Xr ssh 1 ,
or
.Cm rsync Ns :// Ns Ar host Ns / Ns Ar path
or
.Ar host Ns :: Ns Ar path
for connecting to a remote daemon.
Subsequent to the first remote
.Ar source ,
the host may be dropped to become just
.Pf : Ar path
or
.Pf :: Ar path .
.Pp
For connecting to a remote daemon with
.Cm rsync Ns :// Ns Ar host
or
.Ar host Ns :: Ns Ar path ,
the first path component is interpreted as a
.Qq module :
.Ar host Ns :: Ns Ar module Ns / Ns Ar path .
This only applies to the first
.Ar source
invocation; subsequent to that, the module should not be specified.
.Pp
By default, new destination files and directories are given the current
time and the source file permissions.
Updated files retain their existing permissions.
It is an error if updated files have their file types change (e.g.,
updating a directory with a file).
.Pp
At this time,
.Ar source
may only consist of regular files, directories
.Pq only with Fl r ,
or symbolic links
.Pq only with Fl l .
The destination
.Ar directory
must be a directory and is created if not found.
.\" .Sh PATTERNS AND RULES
.\" .Sh ENVIRONMENT
.\" .Sh FILES
.Sh EXIT STATUS
The
.Nm
utility exits 0 on success, 1 if an error occurs, or 2 if the remote
protocol version is older than the local protocol version.
.Sh EXAMPLES
All examples use
.Fl t
so that destination files inherit the source time.
If not changed, subsequent invocations of
.Nm
will then consider the file up to date and not transfer block hashes.
.Pp
To update the out-of-date remote files
.Pa host:dest/bar
and
.Pa host:dest/baz
with the local
.Pa ../src/bar
and
.Pa ../src/baz :
.Pp
.Dl % rsync -t ../src/bar ../src/baz host:dest
.Pp
To update the out-of-date local files
.Pa bar
and
.Pa baz
with the remote files
.Pa host:src/bar
and
.Pa host:src/baz :
.Pp
.Dl % rsync -t host:src/bar :src/baz \&.
.Pp
To update the out-of-date local files
.Pa ../dest/bar
and
.Pa ../dest/baz
with
.Pa bar
and
.Pa baz :
.Pp
.Dl % rsync -t bar baz ../dest
.\" .Sh DIAGNOSTICS
.Sh SEE ALSO
.Xr ssh 1
.Sh STANDARDS
.Nm
is compatible with rsync protocol version 27
as supported by the samba.org implementation of rsync.
.Sh HISTORY
The
.Nm
utility has been available since
.Ox 6.5 .
.Sh AUTHORS
The
.Nm
utility was written by
.An Kristaps Dzonsons Aq Mt kristaps@bsd.lv .
.\" .Sh CAVEATS
.\" .Sh BUGS