Provided by: rsync_3.0.5-1ubuntu2_i386 bug

NAME

       rsync — a fast, versatile, remote (and local) file-copying tool

SYNOPSIS

       Local:  rsync [OPTION...] SRC... [DEST]

       Access via remote shell:
         Pull: rsync [OPTION...] [USER@]HOST:SRC... [DEST]
         Push: rsync [OPTION...] SRC... [USER@]HOST:DEST

       Access via rsync daemon:
         Pull: rsync [OPTION...] [USER@]HOST::SRC... [DEST]
               rsync [OPTION...] rsync://[USER@]HOST[:PORT]/SRC... [DEST]
         Push: rsync [OPTION...] SRC... [USER@]HOST::DEST
               rsync [OPTION...] SRC... rsync://[USER@]HOST[:PORT]/DEST

       Usages with just one SRC arg and no DEST arg will list the source files
       instead of copying.

DESCRIPTION

       Rsync is a fast and extraordinarily versatile file  copying  tool.   It
       can  copy  locally,  to/from  another  host  over  any remote shell, or
       to/from a remote rsync daemon.  It offers a  large  number  of  options
       that  control  every  aspect  of  its behavior and permit very flexible
       specification of the set of files to be copied.  It is famous  for  its
       delta-transfer  algorithm,  which  reduces the amount of data sent over
       the network by sending only the differences between  the  source  files
       and  the  existing  files in the destination.  Rsync is widely used for
       backups and mirroring and as an improved copy command for everyday use.

       Rsync  finds  files  that  need to be transferred using a “quick check”
       algorithm (by default) that looks for files that have changed  in  size
       or   in  last-modified  time.   Any  changes  in  the  other  preserved
       attributes (as requested by options) are made on the  destination  file
       directly  when  the quick check indicates that the file’s data does not
       need to be updated.

       Some of the additional features of rsync are:

       o      support  for  copying  links,  devices,  owners,   groups,   and
              permissions

       o      exclude and exclude-from options similar to GNU tar

       o      a  CVS  exclude  mode for ignoring the same files that CVS would
              ignore

       o      can use any transparent remote shell, including ssh or rsh

       o      does not require super-user privileges

       o      pipelining of file transfers to minimize latency costs

       o      support for anonymous or authenticated rsync daemons (ideal  for
              mirroring)

GENERAL

       Rsync  copies  files either to or from a remote host, or locally on the
       current host (it does not support  copying  files  between  two  remote
       hosts).

       There  are  two  different  ways  for rsync to contact a remote system:
       using a remote-shell program as the transport (such as ssh or  rsh)  or
       contacting   an  rsync  daemon  directly  via  TCP.   The  remote-shell
       transport is used whenever the source or destination  path  contains  a
       single  colon  (:) separator after a host specification.  Contacting an
       rsync daemon directly happens  when  the  source  or  destination  path
       contains  a  double colon (::) separator after a host specification, OR
       when an rsync:// URL is specified (see  also  the  “USING  RSYNC-DAEMON
       FEATURES  VIA  A  REMOTE-SHELL  CONNECTION” section for an exception to
       this latter rule).

       As a special case, if a  single  source  arg  is  specified  without  a
       destination,  the  files  are listed in an output format similar to “ls
       -l”.

       As expected, if neither the source or destination path specify a remote
       host, the copy occurs locally (see also the --list-only option).

       Rsync  refers  to the local side as the “client” and the remote side as
       the “server”.  Don’t confuse “server” with an rsync daemon —  a  daemon
       is  always  a  server, but a server can be either a daemon or a remote-
       shell spawned process.

SETUP

       See the file README for installation instructions.

       Once installed, you can use rsync to any machine that  you  can  access
       via a remote shell (as well as some that you can access using the rsync
       daemon-mode protocol).  For remote transfers, a modern rsync  uses  ssh
       for  its  communications,  but  it  may  have  been configured to use a
       different remote shell by default, such as rsh or remsh.

       You can also specify any remote shell you like, either by using the  -e
       command  line option, or by setting the RSYNC_RSH environment variable.

       Note that rsync must be installed on both the  source  and  destination
       machines.

USAGE

       You  use  rsync  in the same way you use rcp. You must specify a source
       and a destination, one of which may be remote.

       Perhaps the best way to explain the syntax is with some examples:

              rsync -t *.c foo:src/

       This would transfer all files matching the pattern *.c from the current
       directory  to the directory src on the machine foo. If any of the files
       already exist  on  the  remote  system  then  the  rsync  remote-update
       protocol  is  used  to update the file by sending only the differences.
       See the tech report for details.

              rsync -avz foo:src/bar /data/tmp

       This would recursively transfer all files from the directory src/bar on
       the  machine foo into the /data/tmp/bar directory on the local machine.
       The files  are  transferred  in  “archive”  mode,  which  ensures  that
       symbolic  links, devices, attributes, permissions, ownerships, etc. are
       preserved in the transfer.  Additionally, compression will be  used  to
       reduce the size of data portions of the transfer.

              rsync -avz foo:src/bar/ /data/tmp

       A  trailing slash on the source changes this behavior to avoid creating
       an additional directory level at the destination.  You can think  of  a
       trailing / on a source as meaning “copy the contents of this directory”
       as opposed to “copy the directory by  name”,  but  in  both  cases  the
       attributes   of   the  containing  directory  are  transferred  to  the
       containing directory on the destination.  In other words, each  of  the
       following  commands  copies  the files in the same way, including their
       setting of the attributes of /dest/foo:

              rsync -av /src/foo /dest
              rsync -av /src/foo/ /dest/foo

       Note also that host and module  references  don’t  require  a  trailing
       slash to copy the contents of the default directory.  For example, both
       of these copy the remote directory’s contents into “/dest”:

              rsync -av host: /dest
              rsync -av host::module /dest

       You can also use rsync in local-only mode, where both  the  source  and
       destination  don’t have a ‘:’ in the name. In this case it behaves like
       an improved copy command.

       Finally, you can list all  the  (listable)  modules  available  from  a
       particular rsync daemon by leaving off the module name:

              rsync somehost.mydomain.com::

       See the following section for more details.

ADVANCED USAGE

       The  syntax for requesting multiple files from a remote host is done by
       specifying additional remote-host args in the same style as the  first,
       or with the hostname omitted.  For instance, all these work:

              rsync -av host:file1 :file2 host:file{3,4} /dest/
              rsync -av host::modname/file{1,2} host::modname/file3 /dest/
              rsync -av host::modname/file1 ::modname/file{3,4}

       Older  versions  of rsync required using quoted spaces in the SRC, like
       these examples:

              rsync -av host:’dir1/file1 dir2/file2’ /dest
              rsync host::’modname/dir1/file1 modname/dir2/file2’ /dest

       This word-splitting still works (by default) in the latest  rsync,  but
       is not as easy to use as the first method.

       If  you  need  to transfer a filename that contains whitespace, you can
       either specify the --protect-args (-s) option, or you’ll need to escape
       the  whitespace  in  a  way that the remote shell will understand.  For
       instance:

              rsync -av host:’file\ name\ with\ spaces’ /dest

CONNECTING TO AN RSYNC DAEMON

       It is also possible  to  use  rsync  without  a  remote  shell  as  the
       transport.   In  this  case you will directly connect to a remote rsync
       daemon, typically using TCP port 873.   (This  obviously  requires  the
       daemon  to be running on the remote system, so refer to the STARTING AN
       RSYNC DAEMON TO ACCEPT CONNECTIONS section  below  for  information  on
       that.)

       Using  rsync  in  this  way is the same as using it with a remote shell
       except that:

       o      you either use a double colon :: instead of a  single  colon  to
              separate the hostname from the path, or you use an rsync:// URL.

       o      the first word of the “path” is actually a module name.

       o      the remote daemon may print  a  message  of  the  day  when  you
              connect.

       o      if  you  specify no path name on the remote daemon then the list
              of accessible paths on the daemon will be shown.

       o      if you specify no  local  destination  then  a  listing  of  the
              specified files on the remote daemon is provided.

       o      you must not specify the --rsh (-e) option.

       An example that copies all the files in a remote module named “src”:

           rsync -av host::src /dest

       Some  modules  on  the remote daemon may require authentication. If so,
       you will receive a password prompt when you connect. You can avoid  the
       password  prompt  by setting the environment variable RSYNC_PASSWORD to
       the password you want to use or using the --password-file option.  This
       may be useful when scripting rsync.

       WARNING:  On  some  systems  environment  variables  are visible to all
       users. On those systems using --password-file is recommended.

       You may establish the  connection  via  a  web  proxy  by  setting  the
       environment  variable  RSYNC_PROXY  to a hostname:port pair pointing to
       your web proxy.  Note that your web proxy’s configuration must  support
       proxy connections to port 873.

       You  may  also establish a daemon connection using a program as a proxy
       by setting the environment variable RSYNC_CONNECT_PROG to the  commands
       you  wish  to  run  in place of making a direct socket connection.  The
       string may contain the escape “%H” to represent the hostname  specified
       in  the  rsync  command  (so  use “%%” if you need a single “%” in your
       string).  For example:

         export RSYNC_CONNECT_PROG=’ssh proxyhost nc %H 873’
         rsync -av targethost1::module/src/ /dest/
         rsync -av rsync:://targethost2/module/src/ /dest/

       The command specified above uses ssh to run nc (netcat) on a proxyhost,
       which  forwards  all  data  to  port  873  (the  rsync  daemon)  on the
       targethost (%H).

USING RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL CONNECTION

       It is sometimes useful to use various features of an rsync daemon (such
       as  named modules) without actually allowing any new socket connections
       into a system (other than what is already  required  to  allow  remote-
       shell  access).   Rsync  supports  connecting  to a host using a remote
       shell and then spawning a single-use “daemon” server  that  expects  to
       read  its  config file in the home dir of the remote user.  This can be
       useful if you want to encrypt a daemon-style transfer’s data, but since
       the  daemon is started up fresh by the remote user, you may not be able
       to use features such as chroot or change the uid used  by  the  daemon.
       (For  another  way  to encrypt a daemon transfer, consider using ssh to
       tunnel a local port to a remote machine and configure  a  normal  rsync
       daemon on that remote host to only allow connections from “localhost”.)

       From the user’s perspective,  a  daemon  transfer  via  a  remote-shell
       connection  uses nearly the same command-line syntax as a normal rsync-
       daemon transfer, with the only exception being that you must explicitly
       set the remote shell program on the command-line with the --rsh=COMMAND
       option.  (Setting the RSYNC_RSH in the environment  will  not  turn  on
       this functionality.)  For example:

           rsync -av --rsh=ssh host::module /dest

       If you need to specify a different remote-shell user, keep in mind that
       the user@ prefix in front of the  host  is  specifying  the  rsync-user
       value  (for  a  module  that requires user-based authentication).  This
       means that you must give the ’-l user’ option to  ssh  when  specifying
       the remote-shell, as in this example that uses the short version of the
       --rsh option:

           rsync -av -e "ssh -l ssh-user" rsync-user@host::module /dest

       The “ssh-user” will be used at the ssh level; the “rsync-user” will  be
       used to log-in to the “module”.

STARTING AN RSYNC DAEMON TO ACCEPT CONNECTIONS

       In order to connect to an rsync daemon, the remote system needs to have
       a daemon already running (or it needs to have configured something like
       inetd to spawn an rsync daemon for incoming connections on a particular
       port).  For full information  on  how  to  start  a  daemon  that  will
       handling incoming socket connections, see the rsyncd.conf(5) man page —
       that is the config file for  the  daemon,  and  it  contains  the  full
       details  for  how  to  run  the daemon (including stand-alone and inetd
       configurations).

       If you’re using one of the remote-shell transports  for  the  transfer,
       there is no need to manually start an rsync daemon.

EXAMPLES

       Here are some examples of how I use rsync.

       To  backup  my  wife’s  home directory, which consists of large MS Word
       files and mail folders, I use a cron job that runs

              rsync -Cavz . arvidsjaur:backup

       each night over a PPP connection to a duplicate directory on my machine
       “arvidsjaur”.

       To  synchronize  my  samba  source  trees  I use the following Makefile
       targets:

           get:
                   rsync -avuzb --exclude ’*~’ samba:samba/ .
           put:
                   rsync -Cavuzb . samba:samba/
           sync: get put

       this allows me to sync with a CVS directory at the  other  end  of  the
       connection. I then do CVS operations on the remote machine, which saves
       a lot of time as the remote CVS protocol isn’t very efficient.

       I mirror a directory between my “old” and  “new”  ftp  sites  with  the
       command:

       rsync -az -e ssh --delete ~ftp/pub/samba nimbus:"~ftp/pub/tridge"

       This is launched from cron every few hours.

OPTIONS SUMMARY

       Here is a short summary of the options available in rsync. Please refer
       to the detailed description below for a complete description.

        -v, --verbose               increase verbosity
        -q, --quiet                 suppress non-error messages
            --no-motd               suppress daemon-mode MOTD (see caveat)
        -c, --checksum              skip based on checksum, not mod-time & size
        -a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)
            --no-OPTION             turn off an implied OPTION (e.g. --no-D)
        -r, --recursive             recurse into directories
        -R, --relative              use relative path names
            --no-implied-dirs       don’t send implied dirs with --relative
        -b, --backup                make backups (see --suffix & --backup-dir)
            --backup-dir=DIR        make backups into hierarchy based in DIR
            --suffix=SUFFIX         backup suffix (default ~ w/o --backup-dir)
        -u, --update                skip files that are newer on the receiver
            --inplace               update destination files in-place
            --append                append data onto shorter files
            --append-verify         --append w/old data in file checksum
        -d, --dirs                  transfer directories without recursing
        -l, --links                 copy symlinks as symlinks
        -L, --copy-links            transform symlink into referent file/dir
            --copy-unsafe-links     only "unsafe" symlinks are transformed
            --safe-links            ignore symlinks that point outside the tree
        -k, --copy-dirlinks         transform symlink to dir into referent dir
        -K, --keep-dirlinks         treat symlinked dir on receiver as dir
        -H, --hard-links            preserve hard links
        -p, --perms                 preserve permissions
        -E, --executability         preserve executability
            --chmod=CHMOD           affect file and/or directory permissions
        -A, --acls                  preserve ACLs (implies -p)
        -X, --xattrs                preserve extended attributes
        -o, --owner                 preserve owner (super-user only)
        -g, --group                 preserve group
            --devices               preserve device files (super-user only)
            --specials              preserve special files
        -D                          same as --devices --specials
        -t, --times                 preserve modification times
        -O, --omit-dir-times        omit directories from --times
            --super                 receiver attempts super-user activities
            --fake-super            store/recover privileged attrs using xattrs
        -S, --sparse                handle sparse files efficiently
        -n, --dry-run               perform a trial run with no changes made
        -W, --whole-file            copy files whole (w/o delta-xfer algorithm)
        -x, --one-file-system       don’t cross filesystem boundaries
        -B, --block-size=SIZE       force a fixed checksum block-size
        -e, --rsh=COMMAND           specify the remote shell to use
            --rsync-path=PROGRAM    specify the rsync to run on remote machine
            --existing              skip creating new files on receiver
            --ignore-existing       skip updating files that exist on receiver
            --remove-source-files   sender removes synchronized files (non-dir)
            --del                   an alias for --delete-during
            --delete                delete extraneous files from dest dirs
            --delete-before         receiver deletes before transfer (default)
            --delete-during         receiver deletes during xfer, not before
            --delete-delay          find deletions during, delete after
            --delete-after          receiver deletes after transfer, not before
            --delete-excluded       also delete excluded files from dest dirs
            --ignore-errors         delete even if there are I/O errors
            --force                 force deletion of dirs even if not empty
            --max-delete=NUM        don’t delete more than NUM files
            --max-size=SIZE         don’t transfer any file larger than SIZE
            --min-size=SIZE         don’t transfer any file smaller than SIZE
            --partial               keep partially transferred files
            --partial-dir=DIR       put a partially transferred file into DIR
            --delay-updates         put all updated files into place at end
        -m, --prune-empty-dirs      prune empty directory chains from file-list
            --numeric-ids           don’t map uid/gid values by user/group name
            --timeout=SECONDS       set I/O timeout in seconds
            --contimeout=SECONDS    set daemon connection timeout in seconds
        -I, --ignore-times          don’t skip files that match size and time
            --size-only             skip files that match in size
            --modify-window=NUM     compare mod-times with reduced accuracy
        -T, --temp-dir=DIR          create temporary files in directory DIR
        -y, --fuzzy                 find similar file for basis if no dest file
            --compare-dest=DIR      also compare received files relative to DIR
            --copy-dest=DIR         ... and include copies of unchanged files
            --link-dest=DIR         hardlink to files in DIR when unchanged
        -z, --compress              compress file data during the transfer
            --compress-level=NUM    explicitly set compression level
            --skip-compress=LIST    skip compressing files with suffix in LIST
        -C, --cvs-exclude           auto-ignore files in the same way CVS does
        -f, --filter=RULE           add a file-filtering RULE
        -F                          same as --filter=’dir-merge /.rsync-filter’
                                    repeated: --filter=’- .rsync-filter’
            --exclude=PATTERN       exclude files matching PATTERN
            --exclude-from=FILE     read exclude patterns from FILE
            --include=PATTERN       don’t exclude files matching PATTERN
            --include-from=FILE     read include patterns from FILE
            --files-from=FILE       read list of source-file names from FILE
        -0, --from0                 all *from/filter files are delimited by 0s
        -s, --protect-args          no space-splitting; wildcard chars only
            --address=ADDRESS       bind address for outgoing socket to daemon
            --port=PORT             specify double-colon alternate port number
            --sockopts=OPTIONS      specify custom TCP options
            --blocking-io           use blocking I/O for the remote shell
            --stats                 give some file-transfer stats
        -8, --8-bit-output          leave high-bit chars unescaped in output
        -h, --human-readable        output numbers in a human-readable format
            --progress              show progress during transfer
        -P                          same as --partial --progress
        -i, --itemize-changes       output a change-summary for all updates
            --out-format=FORMAT     output updates using the specified FORMAT
            --log-file=FILE         log what we’re doing to the specified FILE
            --log-file-format=FMT   log updates using the specified FMT
            --password-file=FILE    read daemon-access password from FILE
            --list-only             list the files instead of copying them
            --bwlimit=KBPS          limit I/O bandwidth; KBytes per second
            --write-batch=FILE      write a batched update to FILE
            --only-write-batch=FILE like --write-batch but w/o updating dest
            --read-batch=FILE       read a batched update from FILE
            --protocol=NUM          force an older protocol version to be used
            --iconv=CONVERT_SPEC    request charset conversion of filenames
            --checksum-seed=NUM     set block/file checksum seed (advanced)
        -4, --ipv4                  prefer IPv4
        -6, --ipv6                  prefer IPv6
            --version               print version number
       (-h) --help                  show this help (see below for -h comment)

       Rsync can also be run as a daemon, in which case the following  options
       are accepted:

            --daemon                run as an rsync daemon
            --address=ADDRESS       bind to the specified address
            --bwlimit=KBPS          limit I/O bandwidth; KBytes per second
            --config=FILE           specify alternate rsyncd.conf file
            --no-detach             do not detach from the parent
            --port=PORT             listen on alternate port number
            --log-file=FILE         override the "log file" setting
            --log-file-format=FMT   override the "log format" setting
            --sockopts=OPTIONS      specify custom TCP options
        -v, --verbose               increase verbosity
        -4, --ipv4                  prefer IPv4
        -6, --ipv6                  prefer IPv6
        -h, --help                  show this help (if used after --daemon)

OPTIONS

       rsync  uses  the  GNU  long  options  package. Many of the command line
       options have two variants, one short and one  long.   These  are  shown
       below, separated by commas. Some options only have a long variant.  The
       ‘=’ for options that take a parameter is optional;  whitespace  can  be
       used instead.

       --help Print  a  short  help  page  describing the options available in
              rsync and exit.  For backward-compatibility with older  versions
              of  rsync, the help will also be output if you use the -h option
              without any other args.

       --version
              print the rsync version number and exit.

       -v, --verbose
              This option increases the amount of information  you  are  given
              during the transfer.  By default, rsync works silently. A single
              -v  will  give  you  information  about  what  files  are  being
              transferred  and a brief summary at the end. Two -v options will
              give you  information  on  what  files  are  being  skipped  and
              slightly  more  information at the end. More than two -v options
              should only be used if you are debugging rsync.

              Note that the names of the transferred files that are output are
              done  using  a  default  --out-format of “%n%L”, which tells you
              just the name of the file and, if the item is a link,  where  it
              points.   At  the  single  -v  level of verbosity, this does not
              mention when a file gets its attributes changed.  If you ask for
              an itemized list of changed attributes (either --itemize-changes
              or adding “%i” to the --out-format setting), the output (on  the
              client)  increases  to mention all items that are changed in any
              way.  See the --out-format option for more details.

       -q, --quiet
              This option decreases the amount of information  you  are  given
              during  the  transfer,  notably suppressing information messages
              from the remote server. This  option  is  useful  when  invoking
              rsync from cron.

       --no-motd
              This option affects the information that is output by the client
              at the start of a daemon transfer.  This suppresses the message-
              of-the-day  (MOTD) text, but it also affects the list of modules
              that the daemon sends in response to the “rsync host::”  request
              (due to a limitation in the rsync protocol), so omit this option
              if you want to request the list of modules from the daemon.

       -I, --ignore-times
              Normally rsync will skip any files that  are  already  the  same
              size  and  have  the  same  modification timestamp.  This option
              turns off this “quick check” behavior, causing all files  to  be
              updated.

       --size-only
              This  modifies rsync’s “quick check” algorithm for finding files
              that need to be transferred, changing it  from  the  default  of
              transferring files with either a changed size or a changed last-
              modified time to just looking for files  that  have  changed  in
              size.   This  is  useful  when starting to use rsync after using
              another mirroring  system  which  may  not  preserve  timestamps
              exactly.

       --modify-window
              When  comparing  two  timestamps, rsync treats the timestamps as
              being equal if they differ by no  more  than  the  modify-window
              value.   This  is  normally  0 (for an exact match), but you may
              find it useful to set this to a larger value in some situations.
              In  particular,  when  transferring to or from an MS Windows FAT
              filesystem (which represents times with a 2-second  resolution),
              --modify-window=1 is useful (allowing times to differ by up to 1
              second).

       -c, --checksum
              This changes the way rsync checks if the files have been changed
              and  are in need of a transfer.  Without this option, rsync uses
              a “quick check” that (by default) checks if each file’s size and
              time of last modification match between the sender and receiver.
              This option changes this to compare a 128-bit MD4  checksum  for
              each  file  that  has a matching size.  Generating the checksums
              means that both sides will expend a lot of disk I/O reading  all
              the  data in the files in the transfer (and this is prior to any
              reading that will be done to transfer changed  files),  so  this
              can slow things down significantly.

              The  sending  side generates its checksums while it is doing the
              file-system scan that builds the list of  the  available  files.
              The  receiver  generates  its  checksums when it is scanning for
              changed files, and will checksum any file that has the same size
              as the corresponding sender’s file:  files with either a changed
              size or a changed checksum are selected for transfer.

              Note that rsync always verifies that each transferred  file  was
              correctly  reconstructed  on  the  receiving  side by checking a
              whole-file  checksum  that  is  generated   as   the   file   is
              transferred,  but that automatic after-the-transfer verification
              has nothing to do with this option’s  before-the-transfer  “Does
              this file need to be updated?” check.

       -a, --archive
              This  is equivalent to -rlptgoD. It is a quick way of saying you
              want recursion and want to preserve almost everything  (with  -H
              being  a  notable  omission).   The  only exception to the above
              equivalence is when --files-from is specified, in which case  -r
              is not implied.

              Note  that  -a  does  not  preserve  hardlinks,  because finding
              multiply-linked files is expensive.  You must separately specify
              -H.

       --no-OPTION
              You  may  turn  off one or more implied options by prefixing the
              option name with “no-”.  Not all options may be prefixed with  a
              “no-”:  only  options  that  are  implied by other options (e.g.
              --no-D,  --no-perms)  or  have  different  defaults  in  various
              circumstances     (e.g.    --no-whole-file,    --no-blocking-io,
              --no-dirs).  You may specify either the short or the long option
              name  after  the  “no-”  prefix  (e.g.  --no-R  is  the  same as
              --no-relative).

              For example: if you want to use -a (--archive) but don’t want -o
              (--owner),  instead  of  converting  -a  into -rlptgD, you could
              specify -a --no-o (or -a --no-owner).

              The order of the options is important:  if  you  specify  --no-r
              -a,  the -r option would end up being turned on, the opposite of
              -a --no-r.  Note also that the side-effects of the  --files-from
              option  are  NOT  positional, as it affects the default state of
              several options and slightly changes the meaning of -a (see  the
              --files-from option for more details).

       -r, --recursive
              This  tells  rsync  to  copy  directories recursively.  See also
              --dirs (-d).

              Beginning with rsync 3.0.0, the recursive algorithm used is  now
              an  incremental  scan that uses much less memory than before and
              begins  the  transfer  after  the  scanning  of  the  first  few
              directories  have  been  completed.   This incremental scan only
              affects our recursion algorithm, and  does  not  change  a  non-
              recursive  transfer.  It is also only possible when both ends of
              the transfer are at least version 3.0.0.

              Some options require rsync to know the full file list, so  these
              options  disable the incremental recursion mode.  These include:
              --delete-before,   --delete-after,    --prune-empty-dirs,    and
              --delay-updates.   Because of this, the default delete mode when
              you specify --delete is now --delete-during when  both  ends  of
              the  connection are at least 3.0.0 (use --del or --delete-during
              to request this improved deletion mode  explicitly).   See  also
              the  --delete-delay  option  that  is a better choice than using
              --delete-after.

              Incremental   recursion    can    be    disabled    using    the
              --no-inc-recursive option or its shorter --no-i-r alias.

       -R, --relative
              Use  relative  paths.  This  means  that  the  full  path  names
              specified on the command line are sent to the server rather than
              just  the  last  parts  of  the  filenames. This is particularly
              useful when you want to send several  different  directories  at
              the same time. For example, if you used this command:

                 rsync -av /foo/bar/baz.c remote:/tmp/

              ...  this would create a file named baz.c in /tmp/ on the remote
              machine. If instead you used

                 rsync -avR /foo/bar/baz.c remote:/tmp/

              then a file named /tmp/foo/bar/baz.c would  be  created  on  the
              remote  machine,  preserving  its  full  path.  These extra path
              elements are called “implied directories” (i.e.  the  “foo”  and
              the “foo/bar” directories in the above example).

              Beginning  with  rsync  3.0.0,  rsync always sends these implied
              directories as real directories in the file list, even if a path
              element  is really a symlink on the sending side.  This prevents
              some really unexpected behaviors when copying the full path of a
              file  that you didn’t realize had a symlink in its path.  If you
              want to  duplicate  a  server-side  symlink,  include  both  the
              symlink  via its path, and referent directory via its real path.
              If you’re dealing with an older rsync on the sending  side,  you
              may need to use the --no-implied-dirs option.

              It is also possible to limit the amount of path information that
              is sent as implied directories for each path you specify.   With
              a  modern  rsync on the sending side (beginning with 2.6.7), you
              can insert a dot and a slash into the source path, like this:

                 rsync -avR /foo/./bar/baz.c remote:/tmp/

              That would create /tmp/bar/baz.c on the remote  machine.   (Note
              that  the dot must be followed by a slash, so “/foo/.” would not
              be abbreviated.)  (2) For older rsync versions, you  would  need
              to  use  a  chdir  to  limit the source path.  For example, when
              pushing files:

                 (cd /foo; rsync -avR bar/baz.c remote:/tmp/)

              (Note that the parens put the two commands into a sub-shell,  so
              that  the  “cd”  command  doesn’t  remain  in  effect for future
              commands.)  If you’re pulling files from  an  older  rsync,  use
              this idiom (but only for a non-daemon transfer):

                 rsync -avR --rsync-path="cd /foo; rsync" \
                     remote:bar/baz.c /tmp/

       --no-implied-dirs
              This  option  affects  the  default  behavior  of the --relative
              option.  When it is specified, the  attributes  of  the  implied
              directories  from  the  source  names  are  not  included in the
              transfer.  This means that the corresponding  path  elements  on
              the destination system are left unchanged if they exist, and any
              missing implied directories are created with default attributes.
              This  even  allows  these  implied  path  elements  to  have big
              differences, such as being a  symlink  to  a  directory  on  the
              receiving side.

              For  instance,  if a command-line arg or a files-from entry told
              rsync to transfer  the  file  “path/foo/file”,  the  directories
              “path”  and  “path/foo” are implied when --relative is used.  If
              “path/foo” is a symlink to “bar” on the destination system,  the
              receiving  rsync would ordinarily delete “path/foo”, recreate it
              as a directory, and receive the file  into  the  new  directory.
              With    --no-implied-dirs,    the    receiving   rsync   updates
              “path/foo/file” using the existing path  elements,  which  means
              that  the file ends up being created in “path/bar”.  Another way
              to  accomplish  this   link   preservation   is   to   use   the
              --keep-dirlinks  option  (which  will  also  affect  symlinks to
              directories in the rest of the transfer).

              When pulling files from an rsync older than 3.0.0, you may  need
              to use this option if the sending side has a symlink in the path
              you  request  and  you  wish  the  implied  directories  to   be
              transferred as normal directories.

       -b, --backup
              With  this  option, preexisting destination files are renamed as
              each file is transferred or deleted.  You can control where  the
              backup  file  goes  and what (if any) suffix gets appended using
              the --backup-dir and --suffix options.

              Note  that  if  you  don’t   specify   --backup-dir,   (1)   the
              --omit-dir-times  option will be implied, and (2) if --delete is
              also in effect (without --delete-excluded),  rsync  will  add  a
              “protect”  filter-rule  for  the backup suffix to the end of all
              your existing excludes (e.g. -f  "P  *~").   This  will  prevent
              previously backed-up files from being deleted.  Note that if you
              are supplying your own filter rules, you may  need  to  manually
              insert  your own exclude/protect rule somewhere higher up in the
              list so that it has a  high  enough  priority  to  be  effective
              (e.g.,  if  your rules specify a trailing inclusion/exclusion of
              ‘*’, the auto-added rule would never be reached).

       --backup-dir=DIR
              In combination with the --backup option,  this  tells  rsync  to
              store  all  backups  in the specified directory on the receiving
              side.  This can  be  used  for  incremental  backups.   You  can
              additionally  specify  a backup suffix using the --suffix option
              (otherwise the files backed up in the specified  directory  will
              keep their original filenames).

       --suffix=SUFFIX
              This  option  allows  you  to override the default backup suffix
              used with the --backup (-b) option. The default suffix is a ~ if
              no  --backup-dir was specified, otherwise it is an empty string.

       -u, --update
              This  forces  rsync  to  skip  any  files  which  exist  on  the
              destination  and  have  a  modified  time that is newer than the
              source  file.   (If  an  existing   destination   file   has   a
              modification time equal to the source file’s, it will be updated
              if the sizes are different.)

              Note that this does not affect the copying of symlinks or  other
              special  files.   Also,  a difference of file format between the
              sender and receiver is always considered to be important  enough
              for  an update, no matter what date is on the objects.  In other
              words, if the source has a directory where the destination has a
              file, the transfer would occur regardless of the timestamps.

       --inplace
              This  option  changes how rsync transfers a file when the file’s
              data needs to be updated:  instead  of  the  default  method  of
              creating a new copy of the file and moving it into place when it
              is complete, rsync instead writes the updated data  directly  to
              the destination file.

              This  has several effects: (1) in-use binaries cannot be updated
              (either the OS will prevent this  from  happening,  or  binaries
              that attempt to swap-in their data will misbehave or crash), (2)
              the file’s data will be in  an  inconsistent  state  during  the
              transfer, (3) a file’s data may be left in an inconsistent state
              after the transfer if the  transfer  is  interrupted  or  if  an
              update  fails,  (4)  a file that does not have write permissions
              can not be updated, and (5) the  efficiency  of  rsync’s  delta-
              transfer   algorithm   may  be  reduced  if  some  data  in  the
              destination file is overwritten before it can  be  copied  to  a
              position  later  in  the  file  (one exception to this is if you
              combine this option with --backup, since rsync is  smart  enough
              to use the backup file as the basis file for the transfer).

              WARNING: you should not use this option to update files that are
              being accessed by others, so be careful  when  choosing  to  use
              this for a copy.

              This  option  is  useful for transfer of large files with block-
              based changes or appended data, and also  on  systems  that  are
              disk bound, not network bound.

              The option implies --partial (since an interrupted transfer does
              not delete the  file),  but  conflicts  with  --partial-dir  and
              --delay-updates.   Prior  to  rsync  2.6.4  --inplace  was  also
              incompatible with --compare-dest and --link-dest.

       --append
              This causes rsync to update a file by appending  data  onto  the
              end  of  the  file,  which  presumes  that the data that already
              exists on the receiving side is identical with the start of  the
              file on the sending side.  If a file needs to be transferred and
              its size on the receiver is the same or longer than the size  on
              the  sender,  the file is skipped.  This does not interfere with
              the  updating  of  a   file’s   non-content   attributes   (e.g.
              permissions,  ownership, etc.) when the file does not need to be
              transferred, nor does it affect the updating of any  non-regular
              files.   Implies  --inplace, but does not conflict with --sparse
              (since it is always extending a file’s length).

       --append-verify
              This works just like the --append option, but the existing  data
              on  the  receiving  side  is  included in the full-file checksum
              verification step, which will cause a file to be resent  if  the
              final  verification  step  fails  (rsync  uses  a  normal,  non-
              appending --inplace transfer for the resend).

              Note: prior to rsync 3.0.0,  the  --append  option  worked  like
              --append-verify,  so  if you are interacting with an older rsync
              (or the transfer is using a protocol prior  to  30),  specifying
              either  append option will initiate an --append-verify transfer.

       -d, --dirs
              Tell the sending  side  to  include  any  directories  that  are
              encountered.  Unlike --recursive, a directory’s contents are not
              copied unless the directory name specified is “.” or ends with a
              trailing  slash (e.g. “.”, “dir/.”, “dir/”, etc.).  Without this
              option  or  the  --recursive  option,  rsync   will   skip   all
              directories  it  encounters (and output a message to that effect
              for each one).  If you  specify  both  --dirs  and  --recursive,
              --recursive takes precedence.

              The  --dirs  option is implied by the --files-from option or the
              --list-only option (including an implied --list-only  usage)  if
              --recursive  wasn’t  specified  (so that directories are seen in
              the listing).  Specify --no-dirs (or --no-d) if you want to turn
              this off.

              There is also a backward-compatibility helper option, --old-dirs
              (or  --old-d)  that  tells  rsync  to  use   a   hack   of   “-r
              --exclude=’/*/*’”  to  get  an  older  rsync  to  list  a single
              directory without recursing.

       -l, --links
              When symlinks are  encountered,  recreate  the  symlink  on  the
              destination.

       -L, --copy-links
              When  symlinks are encountered, the item that they point to (the
              referent) is copied, rather than the symlink.  In older versions
              of  rsync,  this  option also had the side-effect of telling the
              receiving  side  to  follow  symlinks,  such  as   symlinks   to
              directories.  In a modern rsync such as this one, you’ll need to
              specify --keep-dirlinks (-K) to get this  extra  behavior.   The
              only exception is when sending files to an rsync that is too old
              to understand -K — in that case, the -L option will  still  have
              the side-effect of -K on that older receiving rsync.

       --copy-unsafe-links
              This  tells  rsync  to  copy the referent of symbolic links that
              point outside the  copied  tree.   Absolute  symlinks  are  also
              treated  like  ordinary  files,  and  so are any symlinks in the
              source path itself when --relative is used.  This option has  no
              additional effect if --copy-links was also specified.

       --safe-links
              This  tells  rsync  to  ignore  any  symbolic  links which point
              outside the copied tree. All absolute symlinks are also ignored.
              Using  this  option  in  conjunction  with  --relative  may give
              unexpected results.

       -k, --copy-dirlinks
              This option causes the sending side to  treat  a  symlink  to  a
              directory as though it were a real directory.  This is useful if
              you don’t want symlinks to non-directories to  be  affected,  as
              they would be using --copy-links.

              Without  this  option,  if  the  sending  side  has  replaced  a
              directory with a symlink to a directory, the receiving side will
              delete anything that is in the way of the new symlink, including
              a directory hierarchy (as long as  --force  or  --delete  is  in
              effect).

              See  also  --keep-dirlinks  for  an  analogous  option  for  the
              receiving side.

       -K, --keep-dirlinks
              This option causes the receiving side to treat a  symlink  to  a
              directory  as  though  it  were a real directory, but only if it
              matches a real directory from the sender.  Without this  option,
              the receiver’s symlink would be deleted and replaced with a real
              directory.

              For  example,  suppose  you  transfer  a  directory  “foo”  that
              contains  a  file  “file”,  but  “foo” is a symlink to directory
              “bar” on the receiver.  Without  --keep-dirlinks,  the  receiver
              deletes symlink “foo”, recreates it as a directory, and receives
              the file into the  new  directory.   With  --keep-dirlinks,  the
              receiver keeps the symlink and “file” ends up in “bar”.

              One note of caution:  if you use --keep-dirlinks, you must trust
              all the symlinks  in  the  copy!   If  it  is  possible  for  an
              untrusted user to create their own symlink to any directory, the
              user could then (on a subsequent copy) replace the symlink  with
              a  real  directory  and affect the content of whatever directory
              the symlink references.  For backup copies, you are  better  off
              using something like a bind mount instead of a symlink to modify
              your receiving hierarchy.

              See also --copy-dirlinks for an analogous option for the sending
              side.

       -H, --hard-links
              This  tells  rsync to look for hard-linked files in the transfer
              and link together the corresponding files on the receiving side.
              Without  this  option,  hard-linked  files  in  the transfer are
              treated as though they were separate files.

              When you are updating a non-empty destination, this option  only
              ensures  that  files that are hard-linked together on the source
              are hard-linked  together  on  the  destination.   It  does  NOT
              currently  endeavor  to break already existing hard links on the
              destination that do not exist between the source  files.   Note,
              however,  that  if  one  or more extra-linked files have content
              changes, they will become unlinked when  updated  (assuming  you
              are not using the --inplace option).

              Note  that  rsync  can only detect hard links between files that
              are inside the transfer set.  If rsync updates a file  that  has
              extra  hard-link connections to files outside the transfer, that
              linkage will be broken.  If you are tempted to use the --inplace
              option to avoid this breakage, be very careful that you know how
              your files are being updated so that you  are  certain  that  no
              unintended  changes  happen due to lingering hard links (and see
              the --inplace option for more caveats).

              If incremental recursion is active (see --recursive), rsync  may
              transfer a missing hard-linked file before it finds that another
              link for that contents exists elsewhere in the hierarchy.   This
              does   not  affect  the  accuracy  of  the  transfer,  just  its
              efficiency.  One way to avoid this  is  to  disable  incremental
              recursion using the --no-inc-recursive option.

       -p, --perms
              This  option  causes  the receiving rsync to set the destination
              permissions to be the same as the source permissions.  (See also
              the  --chmod  option for a way to modify what rsync considers to
              be the source permissions.)

              When this option is off, permissions are set as follows:

              o      Existing files (including  updated  files)  retain  their
                     existing  permissions,  though the --executability option
                     might change just the execute permission for the file.

              o      New files get their “normal” permission bits set  to  the
                     source  file’s  permissions  masked  with  the  receiving
                     directory’s default  permissions  (either  the  receiving
                     process’s  umask,  or  the  permissions specified via the
                     destination directory’s default ACL), and  their  special
                     permission  bits  disabled except in the case where a new
                     directory  inherits  a  setgid  bit   from   its   parent
                     directory.

              Thus,  when  --perms  and  --executability  are  both  disabled,
              rsync’s  behavior  is  the  same  as  that  of  other  file-copy
              utilities, such as cp(1) and tar(1).

              In  summary:  to  give  destination files (both old and new) the
              source  permissions,  use  --perms.   To  give  new  files   the
              destination-default  permissions  (while  leaving existing files
              unchanged), make sure that the --perms option  is  off  and  use
              --chmod=ugo=rwX  (which  ensures  that  all  non-masked bits get
              enabled).  If you’d care to make this latter behavior easier  to
              type, you could define a popt alias for it, such as putting this
              line in the file ~/.popt (the following defines the  -Z  option,
              and  includes --no-g to use the default group of the destination
              dir):

                 rsync alias -Z --no-p --no-g --chmod=ugo=rwX

              You could then use this new option in a  command  such  as  this
              one:

                 rsync -avZ src/ dest/

              (Caveat:  make  sure  that -a does not follow -Z, or it will re-
              enable the two “--no-*” options mentioned above.)

              The preservation of  the  destination’s  setgid  bit  on  newly-
              created  directories  when  --perms  is  off  was added in rsync
              2.6.7.  Older rsync versions  erroneously  preserved  the  three
              special permission bits for newly-created files when --perms was
              off, while overriding the destination’s setgid bit setting on  a
              newly-created  directory.   Default  ACL observance was added to
              the ACL patch for rsync 2.6.7,  so  older  (or  non-ACL-enabled)
              rsyncs use the umask even if default ACLs are present.  (Keep in
              mind that it is the version of the receiving rsync that  affects
              these behaviors.)

       -E, --executability
              This  option causes rsync to preserve the executability (or non-
              executability) of regular files when --perms is not enabled.   A
              regular  file is considered to be executable if at least one ‘x’
              is turned on in its permissions.  When an  existing  destination
              file’s  executability  differs  from  that  of the corresponding
              source file, rsync modifies the destination  file’s  permissions
              as follows:

              o      To  make  a  file non-executable, rsync turns off all its
                     ‘x’ permissions.

              o      To make a  file  executable,  rsync  turns  on  each  ‘x’
                     permission   that  has  a  corresponding  ‘r’  permission
                     enabled.

              If --perms is enabled, this option is ignored.

       -A, --acls
              This option causes rsync to update the destination  ACLs  to  be
              the same as the source ACLs.  The option also implies --perms.

              The  source  and  destination  systems  must have compatible ACL
              entries for this option to work properly.  See the  --fake-super
              option  for  a  way  to  backup  and  restore  ACLs that are not
              compatible.

       -X, --xattrs
              This  option  causes  rsync  to  update  the   remote   extended
              attributes to be the same as the local ones.

              For  systems  that support extended-attribute namespaces, a copy
              being  done  by  a  super-user  copies  all  namespaces   except
              system.*.   A  normal user only copies the user.* namespace.  To
              be able to backup and restore non-user namespaces  as  a  normal
              user, see the --fake-super option.

       --chmod
              This  option  tells  rsync  to apply one or more comma-separated
              “chmod” strings to the permission of the files in the  transfer.
              The  resulting value is treated as though it was the permissions
              that the sending side supplied for the file,  which  means  that
              this  option  can  seem  to  have no effect on existing files if
              --perms is not enabled.

              In addition  to  the  normal  parsing  rules  specified  in  the
              chmod(1) manpage, you can specify an item that should only apply
              to a directory by prefixing it with a ‘D’, or  specify  an  item
              that  should  only  apply  to a file by prefixing it with a ‘F’.
              For example:

              --chmod=Dg+s,ug+w,Fo-w,+X

              It is also legal to specify multiple --chmod  options,  as  each
              additional  option  is  just  appended to the list of changes to
              make.

              See  the  --perms  and  --executability  options  for  how   the
              resulting  permission  value  can be applied to the files in the
              transfer.

       -o, --owner
              This option causes rsync to set the  owner  of  the  destination
              file  to  be  the  same  as  the  source  file,  but only if the
              receiving rsync is being run as the  super-user  (see  also  the
              --super  and  --fake-super  options).   Without this option, the
              owner of new and/or transferred files are set  to  the  invoking
              user on the receiving side.

              The  preservation  of ownership will associate matching names by
              default, but may fall back  to  using  the  ID  number  in  some
              circumstances  (see  also  the  --numeric-ids  option for a full
              discussion).

       -g, --group
              This option causes rsync to set the  group  of  the  destination
              file  to  be  the  same  as  the  source file.  If the receiving
              program is not running as the super-user (or if  --no-super  was
              specified),  only groups that the invoking user on the receiving
              side is a member of will be preserved.  Without this option, the
              group  is  set  to the default group of the invoking user on the
              receiving side.

              The preservation of group information  will  associate  matching
              names  by  default,  but may fall back to using the ID number in
              some circumstances (see also the --numeric-ids option for a full
              discussion).

       --devices
              This  option causes rsync to transfer character and block device
              files to the remote system  to  recreate  these  devices.   This
              option  has  no  effect if the receiving rsync is not run as the
              super-user (see also the --super and --fake-super options).

       --specials
              This option causes rsync to transfer special files such as named
              sockets and fifos.

       -D     The -D option is equivalent to --devices --specials.

       -t, --times
              This  tells  rsync to transfer modification times along with the
              files and update them on the remote system.  Note that  if  this
              option  is  not  used, the optimization that excludes files that
              have not been modified cannot be effective; in  other  words,  a
              missing -t or -a will cause the next transfer to behave as if it
              used -I, causing all files to be updated (though rsync’s  delta-
              transfer  algorithm will make the update fairly efficient if the
              files haven’t actually changed, you’re  much  better  off  using
              -t).

       -O, --omit-dir-times
              This  tells  rsync  to  omit  directories  when it is preserving
              modification  times  (see  --times).   If  NFS  is  sharing  the
              directories  on the receiving side, it is a good idea to use -O.
              This  option  is  inferred   if   you   use   --backup   without
              --backup-dir.

       --super
              This  tells  the receiving side to attempt super-user activities
              even if the receiving rsync wasn’t run by the super-user.  These
              activities  include:  preserving  users  via the --owner option,
              preserving all groups (not just the current user’s  groups)  via
              the  --groups  option,  and  copying  devices  via the --devices
              option.  This is useful for systems that allow  such  activities
              without  being  the  super-user,  and also for ensuring that you
              will get errors if the receiving side isn’t being running as the
              super-user.   To  turn off super-user activities, the super-user
              can use --no-super.

       --fake-super
              When  this  option  is  enabled,  rsync   simulates   super-user
              activities  by  saving/restoring  the  privileged attributes via
              special extended attributes that are attached to each  file  (as
              needed).  This includes the file’s owner and group (if it is not
              the default), the file’s device info (device & special files are
              created  as  empty  text files), and any permission bits that we
              won’t allow to be set on the real file (e.g.  the real file gets
              u-s,g-s,o-t  for  safety) or that would limit the owner’s access
              (since the real super-user can always access/change a file,  the
              files  we  create can always be accessed/changed by the creating
              user).  This option also handles ACLs (if --acls was  specified)
              and non-user extended attributes (if --xattrs was specified).

              This  is  a  good way to backup data without using a super-user,
              and to store ACLs from incompatible systems.

              The --fake-super option only affects the side where  the  option
              is   used.    To  affect  the  remote  side  of  a  remote-shell
              connection, specify an rsync path:

                rsync -av --rsync-path="rsync --fake-super" /src/ host:/dest/

              Since there is only one “side” in  a  local  copy,  this  option
              affects both the sending and receiving of files.  You’ll need to
              specify a copy using “localhost” if  you  need  to  avoid  this,
              possibly   using  the  “lsh”  shell  script  (from  the  support
              directory) as a substitute  for  an  actual  remote  shell  (see
              --rsh).

              This option is overridden by both --super and --no-super.

              See  also  the  “fake super” setting in the daemon’s rsyncd.conf
              file.

       -S, --sparse
              Try to handle sparse files efficiently  so  they  take  up  less
              space on the destination.  Conflicts with --inplace because it’s
              not possible to overwrite data in a sparse fashion.

              NOTE: Don’t use this option when the destination  is  a  Solaris
              “tmpfs”  filesystem.  It  doesn’t seem to handle seeks over null
              regions correctly and ends up corrupting the files.

       -n, --dry-run
              This makes rsync perform a  trial  run  that  doesn’t  make  any
              changes (and produces mostly the same output as a real run).  It
              is most commonly used in  combination  with  the  -v,  --verbose
              and/or  -i,  --itemize-changes  options  to  see  what  an rsync
              command is going to do before one actually runs it.

              The output of --itemize-changes is supposed to  be  exactly  the
              same on a dry run and a subsequent real run (barring intentional
              trickery and system call failures); if it isn’t, that’s  a  bug.
              Other output is the same to the extent practical, but may differ
              in some areas.  Notably, a dry run does not send the actual data
              for  file  transfers,  so  --progress  has no effect, the “bytes
              sent”, “bytes received”,  “literal  data”,  and  “matched  data”
              statistics  are too small, and the “speedup” value is equivalent
              to a run where no file transfers are needed.

       -W, --whole-file
              With this option rsync’s delta-transfer algorithm  is  not  used
              and  the  whole file is sent as-is instead.  The transfer may be
              faster if this option is used when  the  bandwidth  between  the
              source  and destination machines is higher than the bandwidth to
              disk  (especially  when  the  “disk”  is  actually  a  networked
              filesystem).   This  is  the  default  when  both the source and
              destination are specified as local paths.

       -x, --one-file-system
              This tells rsync to avoid crossing a  filesystem  boundary  when
              recursing.   This  does  not limit the user’s ability to specify
              items to copy from multiple filesystems, just rsync’s  recursion
              through the hierarchy of each directory that the user specified,
              and also the analogous recursion on the  receiving  side  during
              deletion.  Also keep in mind that rsync treats a “bind” mount to
              the same device as being on the same filesystem.

              If  this  option  is  repeated,  rsync  omits  all   mount-point
              directories  from  the  copy.   Otherwise,  it includes an empty
              directory  at  each  mount-point  it   encounters   (using   the
              attributes  of  the  mounted  directory  because  those  of  the
              underlying mount-point directory are inaccessible).

              If rsync has been told to collapse symlinks (via --copy-links or
              --copy-unsafe-links), a symlink to a directory on another device
              is treated like a mount-point.  Symlinks to non-directories  are
              unaffected by this option.

       --existing, --ignore-non-existing
              This  tells rsync to skip creating files (including directories)
              that do not exist yet on the destination.   If  this  option  is
              combined  with  the  --ignore-existing  option, no files will be
              updated (which can be useful if all you want  to  do  is  delete
              extraneous files).

       --ignore-existing
              This  tells  rsync  to skip updating files that already exist on
              the destination (this does not ignore existing  directories,  or
              nothing would get done).  See also --existing.

              This  option  can  be  useful  for those doing backups using the
              --link-dest option when they need to continue a backup run  that
              got  interrupted.   Since a --link-dest run is copied into a new
              directory hierarchy (when it is used properly),  using  --ignore
              existing  will  ensure  that the already-handled files don’t get
              tweaked (which avoids a change in permissions on the hard-linked
              files).   This does mean that this option is only looking at the
              existing files in the destination hierarchy itself.

       --remove-source-files
              This tells rsync to remove  from  the  sending  side  the  files
              (meaning  non-directories)  that  are a part of the transfer and
              have been successfully duplicated on the receiving side.

       --delete
              This tells rsync to delete extraneous files from  the  receiving
              side  (ones  that  aren’t on the sending side), but only for the
              directories that are being synchronized.  You  must  have  asked
              rsync to send the whole directory (e.g. “dir” or “dir/”) without
              using a wildcard for the  directory’s  contents  (e.g.  “dir/*”)
              since  the wildcard is expanded by the shell and rsync thus gets
              a request to transfer individual files, not  the  files’  parent
              directory.   Files  that are excluded from the transfer are also
              excluded from being deleted unless you use the --delete-excluded
              option  or  mark  the rules as only matching on the sending side
              (see the include/exclude modifiers in the FILTER RULES section).

              Prior  to  rsync  2.6.7, this option would have no effect unless
              --recursive was enabled.  Beginning with 2.6.7,  deletions  will
              also occur when --dirs (-d) is enabled, but only for directories
              whose contents are being copied.

              This option can be dangerous if used incorrectly!  It is a  very
              good  idea to first try a run using the --dry-run option (-n) to
              see what files are going to be deleted.

              If the sending side detects any I/O errors, then the deletion of
              any  files  at  the  destination will be automatically disabled.
              This is to prevent temporary filesystem failures  (such  as  NFS
              errors)  on the sending side causing a massive deletion of files
              on  the  destination.   You   can   override   this   with   the
              --ignore-errors option.

              The   --delete   option   may   be  combined  with  one  of  the
              --delete-WHEN   options   without   conflict,   as    well    as
              --delete-excluded.    However,  if  none  of  the  --delete-WHEN
              options are specified, rsync  will  choose  the  --delete-during
              algorithm  when  talking  to  rsync  3.0.0  or  newer,  and  the
              --delete-before algorithm when talking to an older  rsync.   See
              also --delete-delay and --delete-after.

       --delete-before
              Request  that  the  file-deletions on the receiving side be done
              before the transfer starts.  See --delete (which is implied) for
              more details on file-deletion.

              Deleting  before  the  transfer  is helpful if the filesystem is
              tight for space and removing extraneous files would help to make
              the  transfer  possible.   However,  it  does  introduce a delay
              before the start of the transfer, and this delay might cause the
              transfer  to  timeout  (if  --timeout  was  specified).  It also
              forces rsync to use the old, non-incremental recursion algorithm
              that  requires  rsync to scan all the files in the transfer into
              memory at once (see --recursive).

       --delete-during, --del
              Request that the file-deletions on the receiving  side  be  done
              incrementally as the transfer happens.  The per-directory delete
              scan is done right before each directory is checked for updates,
              so  it  behaves like a more efficient --delete-before, including
              doing the deletions prior  to  any  per-directory  filter  files
              being  updated.   This  option  was first added in rsync version
              2.6.4.  See --delete (which is  implied)  for  more  details  on
              file-deletion.

       --delete-delay
              Request  that  the  file-deletions  on  the  receiving  side  be
              computed during the transfer (like  --delete-during),  and  then
              removed  after  the  transfer  completes.   This  is useful when
              combined  with  --delay-updates  and/or  --fuzzy,  and  is  more
              efficient than using --delete-after (but can behave differently,
              since --delete-after computes the deletions in a  separate  pass
              after  all  updates  are  done).  If the number of removed files
              overflows an internal buffer, a temporary file will  be  created
              on  the  receiving  side  to hold the names (it is removed while
              open, so you shouldn’t see it  during  the  transfer).   If  the
              creation  of  the  temporary  file fails, rsync will try to fall
              back to using --delete-after (which it cannot do if  --recursive
              is  doing an incremental scan).  See --delete (which is implied)
              for more details on file-deletion.

       --delete-after
              Request that the file-deletions on the receiving  side  be  done
              after  the  transfer  has  completed.  This is useful if you are
              sending new per-directory merge files as a part of the  transfer
              and  you  want  their  exclusions  to take effect for the delete
              phase of the current transfer.  It also forces rsync to use  the
              old,  non-incremental recursion algorithm that requires rsync to
              scan all the files in the transfer  into  memory  at  once  (see
              --recursive).   See --delete (which is implied) for more details
              on file-deletion.

       --delete-excluded
              In addition to deleting the files on the receiving side that are
              not  on  the  sending  side, this tells rsync to also delete any
              files on the receiving side that are excluded  (see  --exclude).
              See  the  FILTER  RULES  section  for  a  way to make individual
              exclusions behave this way on the receiver, and  for  a  way  to
              protect  files  from  --delete-excluded.  See --delete (which is
              implied) for more details on file-deletion.

       --ignore-errors
              Tells --delete to go ahead and delete files even when there  are
              I/O errors.

       --force
              This  option tells rsync to delete a non-empty directory when it
              is to be replaced by a non-directory.  This is only relevant  if
              deletions are not active (see --delete for details).

              Note for older rsync versions: --force used to still be required
              when using --delete-after, and  it  used  to  be  non-functional
              unless the --recursive option was also enabled.

       --max-delete=NUM
              This   tells  rsync  not  to  delete  more  than  NUM  files  or
              directories.  If that limit is exceeded, a warning is output and
              rsync exits with an error code of 25 (new for 3.0.0).

              Also new for version 3.0.0, you may specify --max-delete=0 to be
              warned about any extraneous files  in  the  destination  without
              removing  any  of  them.   Older  clients  interpreted  this  as
              “unlimited”, so if you don’t know what version  the  client  is,
              you  can  use  the  less  obvious --max-delete=-1 as a backward-
              compatible way to specify that no deletions be  allowed  (though
              older versions didn’t warn when the limit was exceeded).

       --max-size=SIZE
              This  tells  rsync to avoid transferring any file that is larger
              than the specified SIZE. The SIZE value can be suffixed  with  a
              string  to  indicate  a size multiplier, and may be a fractional
              value (e.g. “--max-size=1.5m”).

              The suffixes are as  follows:  “K”  (or  “KiB”)  is  a  kibibyte
              (1024),  “M”  (or  “MiB”) is a mebibyte (1024*1024), and “G” (or
              “GiB”)  is  a  gibibyte  (1024*1024*1024).   If  you  want   the
              multiplier  to be 1000 instead of 1024, use “KB”, “MB”, or “GB”.
              (Note: lower-case is also accepted for all values.)  Finally, if
              the suffix ends in either “+1” or “-1”, the value will be offset
              by one byte in the indicated direction.

              Examples:   --max-size=1.5mb-1    is    1499999    bytes,    and
              --max-size=2g+1 is 2147483649 bytes.

       --min-size=SIZE
              This  tells rsync to avoid transferring any file that is smaller
              than the specified SIZE, which  can  help  in  not  transferring
              small,  junk files.  See the --max-size option for a description
              of SIZE.

       -B, --block-size=BLOCKSIZE
              This forces  the  block  size  used  in  rsync’s  delta-transfer
              algorithm  to  a  fixed value.  It is normally selected based on
              the size of each file being updated.  See the  technical  report
              for details.

       -e, --rsh=COMMAND
              This  option  allows  you  to choose an alternative remote shell
              program to use for communication between the  local  and  remote
              copies  of  rsync.  Typically, rsync is configured to use ssh by
              default, but you may prefer to use rsh on a local network.

              If this option is used with [user@]host::module/path,  then  the
              remote  shell COMMAND will be used to run an rsync daemon on the
              remote host, and all  data  will  be  transmitted  through  that
              remote  shell  connection,  rather  than through a direct socket
              connection to a running rsync daemon on the  remote  host.   See
              the  section  “USING  RSYNC-DAEMON  FEATURES  VIA A REMOTE-SHELL
              CONNECTION” above.

              Command-line arguments are permitted in  COMMAND  provided  that
              COMMAND  is  presented  to rsync as a single argument.  You must
              use spaces (not  tabs  or  other  whitespace)  to  separate  the
              command and args from each other, and you can use single- and/or
              double-quotes  to  preserve  spaces  in  an  argument  (but  not
              backslashes).   Note  that  doubling  a  single-quote  inside  a
              single-quoted string gives  you  a  single-quote;  likewise  for
              double-quotes  (though you need to pay attention to which quotes
              your shell is parsing and which quotes rsync is parsing).   Some
              examples:

                  -e ’ssh -p 2234’
                  -e ’ssh -o "ProxyCommand nohup ssh firewall nc -w1 %h %p"’

              (Note  that  ssh  users  can alternately customize site-specific
              connect options in their .ssh/config file.)

              You can also choose the remote shell program using the RSYNC_RSH
              environment  variable, which accepts the same range of values as
              -e.

              See also the --blocking-io option  which  is  affected  by  this
              option.

       --rsync-path=PROGRAM
              Use  this  to  specify  what  program is to be run on the remote
              machine to start-up rsync.  Often used when rsync is not in  the
              default            remote-shell’s           path           (e.g.
              --rsync-path=/usr/local/bin/rsync).  Note that  PROGRAM  is  run
              with  the  help of a shell, so it can be any program, script, or
              command sequence you’d care to run,  so  long  as  it  does  not
              corrupt  the  standard-in  & standard-out that rsync is using to
              communicate.

              One tricky example is to set a different  default  directory  on
              the  remote  machine  for  use  with the --relative option.  For
              instance:

                  rsync -avR --rsync-path="cd /a/b && rsync" host:c/d /e/

       -C, --cvs-exclude
              This is a useful shorthand for excluding a broad range of  files
              that you often don’t want to transfer between systems. It uses a
              similar algorithm to CVS  to  determine  if  a  file  should  be
              ignored.

              The  exclude  list is initialized to exclude the following items
              (these initial items are marked as perishable — see  the  FILTER
              RULES section):

                     RCS   SCCS   CVS   CVS.adm   RCSLOG  cvslog.*  tags  TAGS
                     .make.state .nse_depinfo *~ #* .#* ,* _$* *$ *.old  *.bak
                     *.BAK  *.orig *.rej .del-* *.a *.olb *.o *.obj *.so *.exe
                     *.Z *.elc *.ln core .svn/ .git/ .bzr/

              then, files listed in a $HOME/.cvsignore are added to  the  list
              and  any files listed in the CVSIGNORE environment variable (all
              cvsignore names are delimited by whitespace).

              Finally, any file is ignored if it is in the same directory as a
              .cvsignore  file and matches one of the patterns listed therein.
              Unlike rsync’s filter/exclude files, these patterns are split on
              whitespace.  See the cvs(1) manual for more information.

              If  you’re combining -C with your own --filter rules, you should
              note that these CVS excludes are appended at the end of your own
              rules,  regardless  of  where  the -C was placed on the command-
              line.  This makes them a  lower  priority  than  any  rules  you
              specified  explicitly.   If  you want to control where these CVS
              excludes get inserted into your filter rules,  you  should  omit
              the  -C  as  a  command-line  option  and  use  a combination of
              --filter=:C and --filter=-C (either on your command-line  or  by
              putting  the  “:C”  and  “-C” rules into a filter file with your
              other rules).  The  first  option  turns  on  the  per-directory
              scanning for the .cvsignore file.  The second option does a one-
              time import of the CVS excludes mentioned above.

       -f, --filter=RULE
              This option allows you  to  add  rules  to  selectively  exclude
              certain  files from the list of files to be transferred. This is
              most useful in combination with a recursive transfer.

              You may use as many --filter options on the command line as  you
              like  to  build  up the list of files to exclude.  If the filter
              contains whitespace, be sure to quote it so that the shell gives
              the  rule  to  rsync  as a single argument.  The text below also
              mentions that you can use an underscore  to  replace  the  space
              that separates a rule from its arg.

              See  the  FILTER  RULES section for detailed information on this
              option.

       -F     The -F option is a shorthand for adding two  --filter  rules  to
              your command.  The first time it is used is a shorthand for this
              rule:

                 --filter=’dir-merge /.rsync-filter’

              This tells rsync to look for per-directory  .rsync-filter  files
              that  have  been  sprinkled  through the hierarchy and use their
              rules to filter the files in the transfer.  If -F  is  repeated,
              it is a shorthand for this rule:

                 --filter=’exclude .rsync-filter’

              This  filters  out  the  .rsync-filter files themselves from the
              transfer.

              See the FILTER RULES section for  detailed  information  on  how
              these options work.

       --exclude=PATTERN
              This  option  is  a  simplified form of the --filter option that
              defaults to an exclude rule and does not allow  the  full  rule-
              parsing syntax of normal filter rules.

              See  the  FILTER  RULES section for detailed information on this
              option.

       --exclude-from=FILE
              This option is related to the --exclude option, but it specifies
              a  FILE  that  contains  exclude patterns (one per line).  Blank
              lines in the file  and  lines  starting  with  ‘;’  or  ‘#’  are
              ignored.   If  FILE  is  -,  the list will be read from standard
              input.

       --include=PATTERN
              This option is a simplified form of  the  --filter  option  that
              defaults  to  an  include rule and does not allow the full rule-
              parsing syntax of normal filter rules.

              See the FILTER RULES section for detailed  information  on  this
              option.

       --include-from=FILE
              This option is related to the --include option, but it specifies
              a FILE that contains include patterns  (one  per  line).   Blank
              lines  in  the  file  and  lines  starting  with  ‘;’ or ‘#’ are
              ignored.  If FILE is -, the list  will  be  read  from  standard
              input.

       --files-from=FILE
              Using  this option allows you to specify the exact list of files
              to transfer (as read from the specified FILE or -  for  standard
              input).   It  also  tweaks the default behavior of rsync to make
              transferring just the specified files and directories easier:

              o      The --relative (-R) option is  implied,  which  preserves
                     the  path  information that is specified for each item in
                     the file (use --no-relative or --no-R if you want to turn
                     that off).

              o      The  --dirs  (-d)  option  is  implied, which will create
                     directories specified in  the  list  on  the  destination
                     rather  than  noisily  skipping  them  (use  --no-dirs or
                     --no-d if you want to turn that off).

              o      The --archive  (-a)  option’s  behavior  does  not  imply
                     --recursive  (-r),  so specify it explicitly, if you want
                     it.

              o      These side-effects change the default state of rsync,  so
                     the  position  of the --files-from option on the command-
                     line has no bearing on how other options are parsed (e.g.
                     -a  works  the same before or after --files-from, as does
                     --no-R and all other options).

              The filenames that are read from the FILE are  all  relative  to
              the  source  dir  —  any leading slashes are removed and no “..”
              references are allowed to go higher than the  source  dir.   For
              example, take this command:

                 rsync -a --files-from=/tmp/foo /usr remote:/backup

              If  /tmp/foo  contains  the  string  “bin” (or even “/bin”), the
              /usr/bin directory will be created as /backup/bin on the  remote
              host.   If  it  contains  “bin/”  (note the trailing slash), the
              immediate contents of the directory would also be sent  (without
              needing  to  be explicitly mentioned in the file — this began in
              version 2.6.4).  In both cases, if the -r  option  was  enabled,
              that  dir’s  entire hierarchy would also be transferred (keep in
              mind that -r needs to be specified explicitly with --files-from,
              since  it  is  not implied by -a).  Also note that the effect of
              the (enabled by default) --relative option is to duplicate  only
              the path info that is read from the file — it does not force the
              duplication of the source-spec path (/usr in this case).

              In addition, the --files-from file can be read from  the  remote
              host instead of the local host if you specify a “host:” in front
              of the file (the host must match one end of the transfer).  As a
              short-cut, you can specify just a prefix of “:” to mean “use the
              remote end of the transfer”.  For example:

                 rsync -a --files-from=:/path/file-list src:/ /tmp/copy

              This would copy all the files specified in  the  /path/file-list
              file that was located on the remote “src” host.

       -0, --from0
              This  tells  rsync that the rules/filenames it reads from a file
              are terminated by a null (’\0’) character,  not  a  NL,  CR,  or
              CR+LF.     This    affects    --exclude-from,    --include-from,
              --files-from, and any merged files specified in a --filter rule.
              It  does  not  affect --cvs-exclude (since all names read from a
              .cvsignore file are split on whitespace).

              If the --iconv and --protect-args options are specified and  the
              --files-from  filenames are being sent from one host to another,
              the filenames will be translated from the sending host’s charset
              to the receiving host’s charset.

       -s, --protect-args
              This  option  sends all filenames and some options to the remote
              rsync without allowing the remote shell to interpret them.  This
              means  that  spaces are not split in names, and any non-wildcard
              special characters are not translated  (such  as  ~,  $,  ;,  &,
              etc.).   Wildcards  are  expanded  on  the  remote host by rsync
              (instead of the shell doing it).

              If you use this option with  --iconv,  the  args  will  also  be
              translated  from  the  local  to  the remote character-set.  The
              translation happens before wild-cards are  expanded.   See  also
              the --files-from option.

       -T, --temp-dir=DIR
              This  option  instructs  rsync to use DIR as a scratch directory
              when creating temporary copies of the files transferred  on  the
              receiving   side.   The  default  behavior  is  to  create  each
              temporary  file  in  the  same  directory  as   the   associated
              destination file.

              This option is most often used when the receiving disk partition
              does not have enough free space to hold a copy  of  the  largest
              file  in  the  transfer.   In  this  case (i.e. when the scratch
              directory is on a different disk partition), rsync will  not  be
              able  to rename each received temporary file over the top of the
              associated destination file,  but  instead  must  copy  it  into
              place.   Rsync does this by copying the file over the top of the
              destination file, which means that  the  destination  file  will
              contain  truncated data during this copy.  If this were not done
              this way (even if the destination file were first  removed,  the
              data  locally  copied  to  a  temporary  file in the destination
              directory, and then renamed into place) it would be possible for
              the old file to continue taking up disk space (if someone had it
              open), and thus there might not be enough room to  fit  the  new
              version on the disk at the same time.

              If  you  are using this option for reasons other than a shortage
              of  disk  space,  you  may  wish  to   combine   it   with   the
              --delay-updates  option, which will ensure that all copied files
              get  put  into  subdirectories  in  the  destination  hierarchy,
              awaiting the end of the transfer.  If you don’t have enough room
              to  duplicate  all  the  arriving  files  on   the   destination
              partition,  another  way  to  tell  rsync that you aren’t overly
              concerned about disk space is to use  the  --partial-dir  option
              with  a relative path; because this tells rsync that it is OK to
              stash off a copy of a single file in a subdir in the destination
              hierarchy,  rsync  will use the partial-dir as a staging area to
              bring over the copied file, and then rename it into  place  from
              there.  (Specifying  a  --partial-dir with an absolute path does
              not have this side-effect.)

       -y, --fuzzy
              This option tells rsync that it should look for a basis file for
              any  destination  file  that  is missing.  The current algorithm
              looks in the same directory as the destination file for either a
              file  that  has  an  identical  size  and  modified-time,  or  a
              similarly-named file.  If found, rsync uses the fuzzy basis file
              to try to speed up the transfer.

              Note  that  the  use of the --delete option might get rid of any
              potential fuzzy-match files, so  either  use  --delete-after  or
              specify some filename exclusions if you need to prevent this.

       --compare-dest=DIR
              This  option  instructs  rsync  to  use  DIR  on the destination
              machine as an additional hierarchy to compare destination  files
              against  doing  transfers  (if  the  files  are  missing  in the
              destination directory).  If a file  is  found  in  DIR  that  is
              identical to the sender’s file, the file will NOT be transferred
              to the destination directory.  This is  useful  for  creating  a
              sparse  backup  of  just files that have changed from an earlier
              backup.

              Beginning in version 2.6.4, multiple --compare-dest  directories
              may  be  provided,  which will cause rsync to search the list in
              the order specified for an exact match.  If  a  match  is  found
              that  differs  only  in attributes, a local copy is made and the
              attributes updated.  If a match is not found, a basis file  from
              one  of  the  DIRs  will  be  selected  to  try  to speed up the
              transfer.

              If DIR is a relative path, it is  relative  to  the  destination
              directory.  See also --copy-dest and --link-dest.

       --copy-dest=DIR
              This  option  behaves  like  --compare-dest, but rsync will also
              copy unchanged files found in DIR to the  destination  directory
              using a local copy.  This is useful for doing transfers to a new
              destination while leaving existing files intact, and then  doing
              a   flash-cutover   when   all   files  have  been  successfully
              transferred.

              Multiple --copy-dest directories may  be  provided,  which  will
              cause  rsync  to  search  the list in the order specified for an
              unchanged file.  If a match is not found, a basis file from  one
              of the DIRs will be selected to try to speed up the transfer.

              If  DIR  is  a  relative path, it is relative to the destination
              directory.  See also --compare-dest and --link-dest.

       --link-dest=DIR
              This option behaves like --copy-dest, but  unchanged  files  are
              hard  linked  from  DIR to the destination directory.  The files
              must be identical in all preserved attributes (e.g. permissions,
              possibly  ownership)  in  order  for  the  files  to  be  linked
              together.  An example:

                rsync -av --link-dest=$PWD/prior_dir host:src_dir/ new_dir/

              If file’s aren’t linking, double-check their  attributes.   Also
              check  if  some attributes are getting forced outside of rsync’s
              control, such a mount option that  squishes  root  to  a  single
              user,  or  mounts a removable drive with generic ownership (such
              as OS X’s “Ignore ownership on this volume” option).

              Beginning in version 2.6.4, multiple --link-dest directories may
              be  provided,  which  will cause rsync to search the list in the
              order specified for an exact match.  If a match  is  found  that
              differs  only  in  attributes,  a  local  copy  is  made and the
              attributes updated.  If a match is not found, a basis file  from
              one  of  the  DIRs  will  be  selected  to  try  to speed up the
              transfer.

              This option works best when copying into  an  empty  destination
              hierarchy,  as  rsync treats existing files as definitive (so it
              never looks in  the  link-dest  dirs  when  a  destination  file
              already  exists),  and  as  malleable  (so  it  might change the
              attributes of a destination file, which affects  all  the  hard-
              linked versions).

              Note  that if you combine this option with --ignore-times, rsync
              will not link any files together because it only links identical
              files  together as a substitute for transferring the file, never
              as an additional check after the file is updated.

              If DIR is a relative path, it is  relative  to  the  destination
              directory.  See also --compare-dest and --copy-dest.

              Note  that  rsync  versions  prior to 2.6.1 had a bug that could
              prevent --link-dest from working properly for  a  non-super-user
              when  -o  was specified (or implied by -a).  You can work-around
              this bug by avoiding the -o option when sending to an old rsync.

       -z, --compress
              With  this  option, rsync compresses the file data as it is sent
              to the destination machine, which reduces  the  amount  of  data
              being  transmitted  —  something  that  is  useful  over  a slow
              connection.

              Note that this  option  typically  achieves  better  compression
              ratios  than can be achieved by using a compressing remote shell
              or a compressing transport because it  takes  advantage  of  the
              implicit  information  in  the matching data blocks that are not
              explicitly sent over the connection.

              See the --skip-compress option for  the  default  list  of  file
              suffixes that will not be compressed.

       --compress-level=NUM
              Explicitly  set  the  compression  level to use (see --compress)
              instead  of  letting  it  default.   If  NUM  is  non-zero,  the
              --compress option is implied.

       --skip-compress=LIST
              Override  the list of file suffixes that will not be compressed.
              The LIST should be one or more file suffixes (without  the  dot)
              separated by slashes (/).

              You  may specify an empty string to indicate that no file should
              be skipped.

              Simple character-class matching is supported: each must  consist
              of a list of letters inside the square brackets (e.g. no special
              classes, such as “[:alpha:]”, are supported).

              The characters  asterisk  (*)  and  question-mark  (?)  have  no
              special meaning.

              Here’s  an example that specifies 6 suffixes to skip (since 1 of
              the 5 rules matches 2 suffixes):

                  --skip-compress=gz/jpg/mp[34]/7z/bz2

              The default list of suffixes that will not be compressed is this
              (several of these are newly added for 3.0.0):

                  gz/zip/z/rpm/deb/iso/bz2/t[gb]z/7z/mp[34]/mov/avi/ogg/jpg/jpeg

              This  list  will be replaced by your --skip-compress list in all
              but one situation: a copy from a  daemon  rsync  will  add  your
              skipped  suffixes  to its list of non-compressing files (and its
              list may be configured to a different default).

       --numeric-ids
              With this option rsync will transfer numeric group and user  IDs
              rather  than using user and group names and mapping them at both
              ends.

              By  default  rsync  will  use  the  username  and  groupname  to
              determine  what  ownership  to give files. The special uid 0 and
              the special group 0 are never mapped via user/group  names  even
              if the --numeric-ids option is not specified.

              If a user or group has no name on the source system or it has no
              match on the destination system, then the numeric  ID  from  the
              source  system  is  used  instead.  See also the comments on the
              “use chroot” setting in the rsyncd.conf manpage for  information
              on how the chroot setting affects rsync’s ability to look up the
              names of the users and groups and what you can do about it.

       --timeout=TIMEOUT
              This option allows you to set a maximum I/O timeout in  seconds.
              If no data is transferred for the specified time then rsync will
              exit. The default is 0, which means no timeout.

       --contimeout
              This option allows you to set the amount of time that rsync will
              wait  for  its connection to an rsync daemon to succeed.  If the
              timeout is reached, rsync exits with an error.

       --address
              By  default  rsync  will  bind  to  the  wildcard  address  when
              connecting  to an rsync daemon.  The --address option allows you
              to specify a specific IP address (or hostname) to bind to.   See
              also this option in the --daemon mode section.

       --port=PORT
              This  specifies  an alternate TCP port number to use rather than
              the default of 873.  This is only needed if you  are  using  the
              double-colon  (::) syntax to connect with an rsync daemon (since
              the URL syntax has a way to specify the port as a  part  of  the
              URL).  See also this option in the --daemon mode section.

       --sockopts
              This  option can provide endless fun for people who like to tune
              their systems to the utmost degree. You can  set  all  sorts  of
              socket  options  which  may  make transfers faster (or slower!).
              Read the man page for the setsockopt() system call  for  details
              on  some  of  the  options you may be able to set. By default no
              special socket options are set. This only affects direct  socket
              connections  to  a remote rsync daemon.  This option also exists
              in the --daemon mode section.

       --blocking-io
              This tells rsync to use blocking I/O  when  launching  a  remote
              shell  transport.   If  the remote shell is either rsh or remsh,
              rsync defaults to using blocking I/O, otherwise it  defaults  to
              using  non-blocking  I/O.   (Note  that ssh prefers non-blocking
              I/O.)

       -i, --itemize-changes
              Requests a simple itemized list of the changes  that  are  being
              made to each file, including attribute changes.  This is exactly
              the same as specifying --out-format=%i %n%L’.   If  you  repeat
              the option, unchanged files will also be output, but only if the
              receiving rsync is at least version 2.6.7 (you can use -vv  with
              older  versions  of  rsync, but that also turns on the output of
              other verbose messages).

              The “%i” escape has a cryptic output that is  11  letters  long.
              The  general  format  is like the string YXcstpoguax, where Y is
              replaced by the type of update being done, X is replaced by  the
              file-type,  and  the other letters represent attributes that may
              be output if they are being modified.

              The update types that replace the Y are as follows:

              o      A < means that a file is being transferred to the  remote
                     host (sent).

              o      A  >  means that a file is being transferred to the local
                     host (received).

              o      A c means that a local change/creation is  occurring  for
                     the  item  (such  as  the  creation of a directory or the
                     changing of a symlink, etc.).

              o      A h means that the item is a hard link  to  another  item
                     (requires --hard-links).

              o      A  .  means that the item is not being updated (though it
                     might have attributes that are being modified).

              o      A * means that  the  rest  of  the  itemized-output  area
                     contains a message (e.g. “deleting”).

              The  file-types  that replace the X are: f for a file, a d for a
              directory, an L for a symlink, a D for a device, and a S  for  a
              special file (e.g. named sockets and fifos).

              The  other  letters  in  the string above are the actual letters
              that will be output if the associated attribute for the item  is
              being  updated or a “.” for no change.  Three exceptions to this
              are: (1) a newly created item replaces each letter with  a  “+”,
              (2)  an identical item replaces the dots with spaces, and (3) an
              unknown attribute replaces each letter  with  a  “?”  (this  can
              happen when talking to an older rsync).

              The attribute that is associated with each letter is as follows:

              o      A c means either that a  regular  file  has  a  different
                     checksum (requires --checksum) or that a symlink, device,
                     or special file has a changed value.  Note  that  if  you
                     are sending files to an rsync prior to 3.0.1, this change
                     flag will be present only for checksum-differing  regular
                     files.

              o      A  s  means  the  size of a regular file is different and
                     will be updated by the file transfer.

              o      A t means the modification time is different and is being
                     updated  to  the  sender’s  value (requires --times).  An
                     alternate value of T means  that  the  modification  time
                     will  be  set  to the transfer time, which happens when a
                     file/symlink/device is updated without --times and when a
                     symlink  is  changed and the receiver can’t set its time.
                     (Note: when using an rsync 3.0.0 client,  you  might  see
                     the  s  flag combined with t instead of the proper T flag
                     for this time-setting failure.)

              o      A p means the permissions are  different  and  are  being
                     updated to the sender’s value (requires --perms).

              o      An o means the owner is different and is being updated to
                     the  sender’s  value  (requires  --owner  and  super-user
                     privileges).

              o      A  g means the group is different and is being updated to
                     the sender’s value (requires --group and the authority to
                     set the group).

              o      The u slot is reserved for future use.

              o      The a means that the ACL information changed.

              o      The  x  means  that  the  extended  attribute information
                     changed.

              One other output is possible:  when  deleting  files,  the  “%i”
              will  output  the string “*deleting” for each item that is being
              removed (assuming that you are talking to a recent enough  rsync
              that  it  logs deletions instead of outputting them as a verbose
              message).

       --out-format=FORMAT
              This allows you to specify exactly what the rsync client outputs
              to  the user on a per-update basis.  The format is a text string
              containing embedded single-character escape  sequences  prefixed
              with  a  percent  (%) character.   A default format of “%n%L” is
              assumed if -v is specified (which reports the name of  the  file
              and,  if  the item is a link, where it points).  For a full list
              of the possible escape characters, see the “log format”  setting
              in the rsyncd.conf manpage.

              Specifying  the --out-format option will mention each file, dir,
              etc. that gets updated in a significant way (a transferred file,
              a   recreated  symlink/device,  or  a  touched  directory).   In
              addition, if the itemize-changes escape (%i) is included in  the
              string  (e.g.  if  the  --itemize-changes  option was used), the
              logging of names increases to mention any item that  is  changed
              in  any  way  (as long as the receiving side is at least 2.6.4).
              See the --itemize-changes option for a description of the output
              of “%i”.

              Rsync  will  output  the  out-format  string  prior  to a file’s
              transfer  unless  one  of  the  transfer-statistic  escapes   is
              requested,  in  which case the logging is done at the end of the
              file’s transfer.  When  this  late  logging  is  in  effect  and
              --progress is also specified, rsync will also output the name of
              the file being transferred prior  to  its  progress  information
              (followed, of course, by the out-format output).

       --log-file=FILE
              This  option  causes  rsync  to  log what it is doing to a file.
              This is similar to the logging that a daemon does,  but  can  be
              requested  for  the client side and/or the server side of a non-
              daemon transfer.  If specified  as  a  client  option,  transfer
              logging will be enabled with a default format of “%i %n%L”.  See
              the --log-file-format option if you wish to override this.

              Here’s a example command that requests the remote  side  to  log
              what is happening:

                rsync -av --rsync-path="rsync --log-file=/tmp/rlog" src/ dest/

              This  is  very  useful  if you need to debug why a connection is
              closing unexpectedly.

       --log-file-format=FORMAT
              This allows you to specify exactly what  per-update  logging  is
              put into the file specified by the --log-file option (which must
              also be specified for this option to have any effect).   If  you
              specify  an empty string, updated files will not be mentioned in
              the log file.  For a list of the possible escape characters, see
              the “log format” setting in the rsyncd.conf manpage.

       --stats
              This  tells  rsync  to  print a verbose set of statistics on the
              file transfer, allowing you to tell how effective rsync’s delta-
              transfer algorithm is for your data.

              The current statistics are as follows:

              o      Number  of  files  is  the  count  of all “files” (in the
                     generic sense),  which  includes  directories,  symlinks,
                     etc.

              o      Number  of files transferred is the count of normal files
                     that were updated via rsync’s  delta-transfer  algorithm,
                     which does not include created dirs, symlinks, etc.

              o      Total file size is the total sum of all file sizes in the
                     transfer.  This does not count any size  for  directories
                     or  special files, but does include the size of symlinks.

              o      Total transferred file size is the total sum of all files
                     sizes for just the transferred files.

              o      Literal  data  is  how much unmatched file-update data we
                     had to send to  the  receiver  for  it  to  recreate  the
                     updated files.

              o      Matched  data  is  how much data the receiver got locally
                     when recreating the updated files.

              o      File list size is how big the file-list data was when the
                     sender sent it to the receiver.  This is smaller than the
                     in-memory size for the file list due to some  compressing
                     of duplicated data when rsync sends the list.

              o      File  list  generation time is the number of seconds that
                     the sender spent creating the file list.  This requires a
                     modern  rsync on the sending side for this to be present.

              o      File list transfer time is the number of seconds that the
                     sender spent sending the file list to the receiver.

              o      Total bytes sent is the count of all the bytes that rsync
                     sent from the client side to the server side.

              o      Total bytes received is  the  count  of  all  non-message
                     bytes  that  rsync  received  by the client side from the
                     server side.  “Non-message” bytes  means  that  we  don’t
                     count  the  bytes  for  a verbose message that the server
                     sent to us, which makes the stats more consistent.

       -8, --8-bit-output
              This tells rsync to leave all high-bit characters  unescaped  in
              the  output  instead  of  trying  to test them to see if they’re
              valid in the current locale and escaping the invalid ones.   All
              control   characters   (but  never  tabs)  are  always  escaped,
              regardless of this option’s setting.

              The escape idiom that started in 2.6.7 is to  output  a  literal
              backslash  (\)  and  a  hash  (#),  followed  by exactly 3 octal
              digits.  For example, a newline  would  output  as  “\#012”.   A
              literal backslash that is in a filename is not escaped unless it
              is followed by a hash and 3 digits (0-9).

       -h, --human-readable
              Output numbers in a more human-readable format.  This makes  big
              numbers output using larger units, with a K, M, or G suffix.  If
              this option was specified once, these  units  are  K  (1000),  M
              (1000*1000),  and G (1000*1000*1000); if the option is repeated,
              the units are powers of 1024 instead of 1000.

       --partial
              By default, rsync will delete any partially transferred file  if
              the  transfer  is  interrupted. In some circumstances it is more
              desirable  to  keep  partially  transferred  files.  Using   the
              --partial  option  tells  rsync  to  keep the partial file which
              should make a subsequent transfer of the rest of the  file  much
              faster.

       --partial-dir=DIR
              A  better way to keep partial files than the --partial option is
              to specify a DIR that will be used  to  hold  the  partial  data
              (instead  of  writing  it  out to the destination file).  On the
              next transfer, rsync will use a file found in this dir  as  data
              to  speed  up  the resumption of the transfer and then delete it
              after it has served its purpose.

              Note  that  if  --whole-file  is  specified  (or  implied),  any
              partial-dir  file that is found for a file that is being updated
              will simply be removed (since rsync  is  sending  files  without
              using rsync’s delta-transfer algorithm).

              Rsync  will create the DIR if it is missing (just the last dir —
              not the whole path).  This makes it easy to use a relative  path
              (such  as  “--partial-dir=.rsync-partial”)  to have rsync create
              the partial-directory in the destination file’s  directory  when
              needed,  and  then  remove  it  again  when  the partial file is
              deleted.

              If the partial-dir value is not an absolute path, rsync will add
              an  exclude rule at the end of all your existing excludes.  This
              will prevent the sending of any partial-dir files that may exist
              on the sending side, and will also prevent the untimely deletion
              of partial-dir items on the receiving  side.   An  example:  the
              above  --partial-dir  option would add the equivalent of “-f-p
              .rsync-partial/’” at the end of any other filter rules.

              If you are supplying your own exclude rules, you may need to add
              your  own  exclude/hide/protect rule for the partial-dir because
              (1) the auto-added rule may be ineffective at the  end  of  your
              other  rules,  or  (2)  you may wish to override rsync’s exclude
              choice.  For instance, if you want to make  rsync  clean-up  any
              left-over  partial-dirs  that  may  be  lying around, you should
              specify --delete-after and add a “risk” filter rule, e.g.  -fR
              .rsync-partial/’.      (Avoid     using    --delete-before    or
              --delete-during unless you don’t need rsync to use  any  of  the
              left-over partial-dir data during the current run.)

              IMPORTANT:  the  --partial-dir  should  not be writable by other
              users or it is a security risk.  E.g. AVOID “/tmp”.

              You can also set the  partial-dir  value  the  RSYNC_PARTIAL_DIR
              environment  variable.  Setting this in the environment does not
              force --partial to be  enabled,  but  rather  it  affects  where
              partial  files  go  when  --partial is specified.  For instance,
              instead of using --partial-dir=.rsync-tmp along with --progress,
              you  could  set RSYNC_PARTIAL_DIR=.rsync-tmp in your environment
              and then just use the -P option  to  turn  on  the  use  of  the
              .rsync-tmp  dir  for partial transfers.  The only times that the
              --partial option does not look for this  environment  value  are
              (1) when --inplace was specified (since --inplace conflicts with
              --partial-dir), and (2) when --delay-updates was specified  (see
              below).

              For   the  purposes  of  the  daemon-config’s  “refuse  options”
              setting, --partial-dir does not imply  --partial.   This  is  so
              that  a  refusal of the --partial option can be used to disallow
              the overwriting of destination files with  a  partial  transfer,
              while  still allowing the safer idiom provided by --partial-dir.

       --delay-updates
              This option puts the temporary file from each updated file  into
              a holding directory until the end of the transfer, at which time
              all the files are renamed into place in rapid succession.   This
              attempts to make the updating of the files a little more atomic.
              By default the files are placed into a directory named  “.~tmp~”
              in  each  file’s  destination directory, but if you’ve specified
              the --partial-dir option, that directory will be  used  instead.
              See  the  comments in the --partial-dir section for a discussion
              of how this “.~tmp~” dir will be excluded from the transfer, and
              what  you  can do if you want rsync to cleanup old “.~tmp~” dirs
              that might  be  lying  around.   Conflicts  with  --inplace  and
              --append.

              This  option uses more memory on the receiving side (one bit per
              file transferred) and also requires enough free  disk  space  on
              the receiving side to hold an additional copy of all the updated
              files.  Note also that you should not use an  absolute  path  to
              --partial-dir  unless (1) there is no chance of any of the files
              in the transfer having the same  name  (since  all  the  updated
              files  will  be  put  into  a  single  directory  if the path is
              absolute) and (2) there are no mount  points  in  the  hierarchy
              (since  the  delayed  updates will fail if they can’t be renamed
              into place).

              See also the “atomic-rsync” perl script in the “support”  subdir
              for  an  update  algorithm  that  is  even  more atomic (it uses
              --link-dest and a parallel hierarchy of files).

       -m, --prune-empty-dirs
              This option tells the  receiving  rsync  to  get  rid  of  empty
              directories  from  the  file-list,  including nested directories
              that  have  no  non-directory  children.   This  is  useful  for
              avoiding the creation of a bunch of useless directories when the
              sending rsync is recursively scanning a hierarchy of files using
              include/exclude/filter rules.

              Because the file-list is actually being pruned, this option also
              affects what directories get deleted when a  delete  is  active.
              However,  keep  in  mind that excluded files and directories can
              prevent existing items from being deleted  (because  an  exclude
              hides source files and protects destination files).

              You  can  prevent  the pruning of certain empty directories from
              the file-list by using a global “protect” filter.  For instance,
              this  option would ensure that the directory “emptydir” was kept
              in the file-list:

              --filter ’protect emptydir/’

              Here’s an example that copies all .pdf  files  in  a  hierarchy,
              only  creating the necessary destination directories to hold the
              .pdf  files,  and  ensures  that  any  superfluous   files   and
              directories in the destination are removed (note the hide filter
              of non-directories being used instead of an exclude):

              rsync -avm --del --include=’*.pdf’ -f ’hide,! */’ src/ dest

              If you didn’t want to remove superfluous destination files,  the
              more  time-honored  options  of  “--include=*/--exclude=*’”
              would work fine in place of the hide-filter  (if  that  is  more
              natural to you).

       --progress
              This  option  tells  rsync  to  print  information  showing  the
              progress of the transfer. This gives a bored user  something  to
              watch.  Implies --verbose if it wasn’t already specified.

              While  rsync  is  transferring  a  regular  file,  it  updates a
              progress line that looks like this:

                    782448  63%  110.64kB/s    0:00:04

              In this example, the receiver has reconstructed 782448 bytes  or
              63% of the sender’s file, which is being reconstructed at a rate
              of 110.64 kilobytes per second, and the transfer will finish  in
              4 seconds if the current rate is maintained until the end.

              These  statistics  can  be  misleading if rsync’s delta-transfer
              algorithm is in use.  For example, if the sender’s file consists
              of the basis file followed by additional data, the reported rate
              will probably drop dramatically when the receiver  gets  to  the
              literal data, and the transfer will probably take much longer to
              finish than the receiver  estimated  as  it  was  finishing  the
              matched part of the file.

              When  the  file  transfer  finishes, rsync replaces the progress
              line with a summary line that looks like this:

                   1238099 100%  146.38kB/s    0:00:08  (xfer#5, to-check=169/396)

              In this example, the file was 1238099 bytes long in  total,  the
              average rate of transfer for the whole file was 146.38 kilobytes
              per second over the 8 seconds that it took to complete,  it  was
              the  5th  transfer  of  a  regular file during the current rsync
              session, and there are 169 more files for the receiver to  check
              (to  see if they are up-to-date or not) remaining out of the 396
              total files in the file-list.

       -P     The -P  option  is  equivalent  to  --partial  --progress.   Its
              purpose  is  to make it much easier to specify these two options
              for a long transfer that may be interrupted.

       --password-file
              This option allows you to provide  a  password  in  a  file  for
              accessing an rsync daemon.  The file must not be world readable.
              It should contain just the password as a single line.

              This option does  not  supply  a  password  to  a  remote  shell
              transport  such  as  ssh;  to  learn how to do that, consult the
              remote shell’s documentation.  When accessing  an  rsync  daemon
              using  a  remote  shell as the transport, this option only comes
              into effect after the remote shell finishes  its  authentication
              (i.e.  if  you  have  also  specified a password in the daemon’s
              config file).

       --list-only
              This option will cause the source files to be listed instead  of
              transferred.   This  option  is  inferred  if  there is a single
              source arg and no destination specified, so its main  uses  are:
              (1)  to turn a copy command that includes a destination arg into
              a file-listing command, or (2) to be able to specify  more  than
              one  source  arg  (note:  be  sure  to include the destination).
              Caution: keep in mind that a source  arg  with  a  wild-card  is
              expanded by the shell into multiple args, so it is never safe to
              try to list such an arg without using this option.  For example:

                  rsync -av --list-only foo* dest/

              Compatibility  note:   when requesting a remote listing of files
              from an rsync that is version 2.6.3 or older, you may  encounter
              an  error  if  you  ask  for  a  non-recursive listing.  This is
              because  a  file  listing  implies   the   --dirs   option   w/o
              --recursive,  and older rsyncs don’t have that option.  To avoid
              this problem, either specify the --no-dirs option (if you  don’t
              need  to expand a directory’s content), or turn on recursion and
              exclude the content of subdirectories: -r --exclude=/*/*’.

       --bwlimit=KBPS
              This option allows you to specify a  maximum  transfer  rate  in
              kilobytes  per  second. This option is most effective when using
              rsync with large files (several megabytes and up).  Due  to  the
              nature  of  rsync  transfers,  blocks  of data are sent, then if
              rsync determines the transfer was too fast, it will wait  before
              sending  the  next data block. The result is an average transfer
              rate equaling the specified limit. A value of zero specifies  no
              limit.

       --write-batch=FILE
              Record  a  file  that  can later be applied to another identical
              destination with --read-batch. See the “BATCH MODE” section  for
              details, and also the --only-write-batch option.

       --only-write-batch=FILE
              Works like --write-batch, except that no updates are made on the
              destination system when  creating  the  batch.   This  lets  you
              transport  the  changes to the destination system via some other
              means and then apply the changes via --read-batch.

              Note that you can feel free to write the batch directly to  some
              portable  media:  if this media fills to capacity before the end
              of the transfer, you can just apply that partial transfer to the
              destination  and repeat the whole process to get the rest of the
              changes  (as  long  as  you  don’t  mind  a  partially   updated
              destination system while the multi-update cycle is happening).

              Also note that you only save bandwidth when pushing changes to a
              remote system  because  this  allows  the  batched  data  to  be
              diverted  from  the sender into the batch file without having to
              flow over the wire to the receiver (when pulling, the sender  is
              remote, and thus can’t write the batch).

       --read-batch=FILE
              Apply  all  of  the  changes  stored  in FILE, a file previously
              generated by --write-batch.  If FILE is -, the batch  data  will
              be  read  from standard input.  See the “BATCH MODE” section for
              details.

       --protocol=NUM
              Force an older protocol version to be used.  This is useful  for
              creating  a  batch file that is compatible with an older version
              of rsync.  For instance, if rsync 2.6.4 is being used  with  the
              --write-batch  option,  but  rsync 2.6.3 is what will be used to
              run the --read-batch option, you should use “--protocol=28” when
              creating  the  batch file to force the older protocol version to
              be used in the batch file (assuming you can’t upgrade the  rsync
              on the reading system).

       --iconv=CONVERT_SPEC
              Rsync  can  convert  filenames between character sets using this
              option.  Using a CONVERT_SPEC of “.” tells rsync to look up  the
              default  character-set via the locale setting.  Alternately, you
              can fully specify what conversion to do by giving a local and  a
              remote   charset   separated   by   a   comma   in   the   order
              --iconv=LOCAL,REMOTE, e.g.  --iconv=utf8,iso88591.   This  order
              ensures  that  the  option  will  stay  the  same whether you’re
              pushing or pulling  files.   Finally,  you  can  specify  either
              --no-iconv  or a CONVERT_SPEC of “-” to turn off any conversion.
              The default setting of this option  is  site-specific,  and  can
              also be affected via the RSYNC_ICONV environment variable.

              For  a  list  of  what  charset  names  your local iconv library
              supports, you can run “iconv --list”.

              If you  specify  the  --protect-args  option  (-s),  rsync  will
              translate the filenames you specify on the command-line that are
              being sent to  the  remote  host.   See  also  the  --files-from
              option.

              Note  that  rsync  does not do any conversion of names in filter
              files (including include/exclude files).  It is  up  to  you  to
              ensure  that  you’re specifying matching rules that can match on
              both sides of the transfer.  For instance, you can specify extra
              include/exclude  rules  if there are filename differences on the
              two sides that need to be accounted for.

              When you pass an --iconv option to an rsync daemon  that  allows
              it,  the  daemon  uses  the  charset  specified in its “charset”
              configuration parameter regardless of  the  remote  charset  you
              actually  pass.   Thus,  you  may  feel free to specify just the
              local charset for a daemon transfer (e.g. --iconv=utf8).

       -4, --ipv4 or -6, --ipv6
              Tells rsync to prefer IPv4/IPv6  when  creating  sockets.   This
              only affects sockets that rsync has direct control over, such as
              the outgoing socket when directly contacting  an  rsync  daemon.
              See also these options in the --daemon mode section.

              If  rsync  was  complied  without  support  for IPv6, the --ipv6
              option will have no effect.  The --version output will tell  you
              if this is the case.

       --checksum-seed=NUM
              Set  the  MD4  checksum  seed  to  the integer NUM.  This 4 byte
              checksum seed is included in each block and  file  MD4  checksum
              calculation.   By  default the checksum seed is generated by the
              server and defaults to the current time() .  This option is used
              to   set   a   specific  checksum  seed,  which  is  useful  for
              applications that want repeatable block and file  checksums,  or
              in  the  case  where the user wants a more random checksum seed.
              Setting NUM to 0 causes rsync to use the default of  time()  for
              checksum seed.

DAEMON OPTIONS

       The options allowed when starting an rsync daemon are as follows:

       --daemon
              This  tells rsync that it is to run as a daemon.  The daemon you
              start running may be accessed using an rsync  client  using  the
              host::module or rsync://host/module/ syntax.

              If  standard input is a socket then rsync will assume that it is
              being run via inetd, otherwise it will detach from  the  current
              terminal  and  become a background daemon.  The daemon will read
              the config file (rsyncd.conf) on each connect made by  a  client
              and respond to requests accordingly.  See the rsyncd.conf(5) man
              page for more details.

       --address
              By default rsync will bind to the wildcard address when run as a
              daemon  with  the  --daemon option.  The --address option allows
              you to specify a specific IP address (or hostname) to  bind  to.
              This  makes  virtual  hosting  possible  in conjunction with the
              --config option.  See also the “address” global  option  in  the
              rsyncd.conf manpage.

       --bwlimit=KBPS
              This  option  allows  you  to specify a maximum transfer rate in
              kilobytes per second for the data the daemon sends.  The  client
              can still specify a smaller --bwlimit value, but their requested
              value will be rounded down if they try to exceed  it.   See  the
              client version of this option (above) for some extra details.

       --config=FILE
              This  specifies an alternate config file than the default.  This
              is only relevant when --daemon is  specified.   The  default  is
              /etc/rsyncd.conf  unless  the  daemon  is  running over a remote
              shell program and the remote user is not the super-user; in that
              case  the  default  is  rsyncd.conf  in  the  current  directory
              (typically $HOME).

       --no-detach
              When running as a daemon, this option  instructs  rsync  to  not
              detach  itself  and become a background process.  This option is
              required when running as a service on Cygwin, and  may  also  be
              useful when rsync is supervised by a program such as daemontools
              or  AIX’s  System  Resource  Controller.   --no-detach  is  also
              recommended when rsync is run under a debugger.  This option has
              no effect if rsync is run from inetd or sshd.

       --port=PORT
              This specifies an alternate TCP port number for  the  daemon  to
              listen  on  rather than the default of 873.  See also the “port”
              global option in the rsyncd.conf manpage.

       --log-file=FILE
              This option tells the rsync daemon to  use  the  given  log-file
              name instead of using the “log file” setting in the config file.

       --log-file-format=FORMAT
              This option tells the rsync  daemon  to  use  the  given  FORMAT
              string  instead  of using the “log format” setting in the config
              file.  It also enables “transfer logging” unless the  string  is
              empty, in which case transfer logging is turned off.

       --sockopts
              This  overrides  the  socket  options setting in the rsyncd.conf
              file and has the same syntax.

       -v, --verbose
              This option increases the amount of information the daemon  logs
              during  its  startup  phase.   After  the  client  connects, the
              daemon’s verbosity level will be controlled by the options  that
              the  client used and the “max verbosity” setting in the module’s
              config section.

       -4, --ipv4 or -6, --ipv6
              Tells rsync to  prefer  IPv4/IPv6  when  creating  the  incoming
              sockets   that   the   rsync  daemon  will  use  to  listen  for
              connections.  One of these options  may  be  required  in  older
              versions  of  Linux to work around an IPv6 bug in the kernel (if
              you see an “address already in use” error when nothing  else  is
              using  the  port,  try specifying --ipv6 or --ipv4 when starting
              the daemon).

              If rsync was complied  without  support  for  IPv6,  the  --ipv6
              option  will have no effect.  The --version output will tell you
              if this is the case.

       -h, --help
              When  specified  after  --daemon,  print  a  short   help   page
              describing the options available for starting an rsync daemon.

FILTER RULES

       The  filter  rules  allow  for  flexible  selection  of  which files to
       transfer (include) and which files to skip (exclude).  The rules either
       directly  specify  include/exclude  patterns  or  they specify a way to
       acquire more include/exclude patterns (e.g. to read them from a  file).

       As  the  list  of  files/directories to transfer is built, rsync checks
       each name  to  be  transferred  against  the  list  of  include/exclude
       patterns in turn, and the first matching pattern is acted on:  if it is
       an exclude pattern, then that file is skipped;  if  it  is  an  include
       pattern  then  that  filename is not skipped; if no matching pattern is
       found, then the filename is not skipped.

       Rsync builds an ordered list  of  filter  rules  as  specified  on  the
       command-line.  Filter rules have the following syntax:

              RULE [PATTERN_OR_FILENAME]
              RULE,MODIFIERS [PATTERN_OR_FILENAME]

       You  have  your  choice  of  using  either short or long RULE names, as
       described below.  If you use a short-named rule, the ‘,’ separating the
       RULE  from  the  MODIFIERS  is  optional.  The PATTERN or FILENAME that
       follows (when present) must come after either  a  single  space  or  an
       underscore (_).  Here are the available rule prefixes:

              exclude, - specifies an exclude pattern.
              include, + specifies an include pattern.
              merge, . specifies a merge-file to read for more rules.
              dir-merge, : specifies a per-directory merge-file.
              hide,  H specifies a pattern for hiding files from the transfer.
              show, S files that match the pattern are not hidden.
              protect,  P  specifies  a  pattern  for  protecting  files  from
              deletion.
              risk, R files that match the pattern are not protected.
              clear, ! clears the current include/exclude list (takes no arg)

       When  rules are being read from a file, empty lines are ignored, as are
       comment lines that start with a “#”.

       Note that the --include/--exclude command-line options do not allow the
       full  range  of  rule  parsing as described above — they only allow the
       specification of include/exclude patterns plus a “!” token to clear the
       list  (and the normal comment parsing when rules are read from a file).
       If a pattern does not begin with “- ” (dash,  space)  or  “+  ”  (plus,
       space),  then  the  rule will be interpreted as if “+ ” (for an include
       option) or “- ” (for an exclude option) were prefixed to the string.  A
       --filter  option, on the other hand, must always contain either a short
       or long rule name at the start of the rule.

       Note also that the --filter, --include, and --exclude options take  one
       rule/pattern  each. To add multiple ones, you can repeat the options on
       the command-line, use the merge-file syntax of the --filter option,  or
       the --include-from/--exclude-from options.

INCLUDE/EXCLUDE PATTERN RULES

       You can include and exclude files by specifying patterns using the “+”,
       “-”, etc. filter rules (as  introduced  in  the  FILTER  RULES  section
       above).   The  include/exclude  rules  each  specify  a pattern that is
       matched  against  the  names  of  the  files  that  are  going  to   be
       transferred.  These patterns can take several forms:

       o      if  the  pattern  starts  with  a  /  then  it  is anchored to a
              particular spot in the  hierarchy  of  files,  otherwise  it  is
              matched  against  the end of the pathname.  This is similar to a
              leading ^ in regular expressions.  Thus  “/foo”  would  match  a
              name of “foo” at either the “root of the transfer” (for a global
              rule) or in the  merge-file’s  directory  (for  a  per-directory
              rule).   An  unqualified  “foo”  would  match  a  name  of “foo”
              anywhere  in  the  tree  because  the   algorithm   is   applied
              recursively  from  the  top  down;  it  behaves  as if each path
              component gets a turn at being the end of  the  filename.   Even
              the  unanchored  “sub/foo”  would  match  at  any  point  in the
              hierarchy where a “foo”  was  found  within  a  directory  named
              “sub”.   See  the  section on ANCHORING INCLUDE/EXCLUDE PATTERNS
              for a full discussion of how to specify a pattern  that  matches
              at the root of the transfer.

       o      if  the  pattern  ends  with  a  /  then  it  will  only match a
              directory, not a regular file, symlink, or device.

       o      rsync chooses between doing a simple string match  and  wildcard
              matching  by checking if the pattern contains one of these three
              wildcard characters: ‘*’, ‘?’, and ‘[’ .

       o      a ‘*’ matches any path component, but it stops at slashes.

       o      use ’**’ to match anything, including slashes.

       o      a ‘?’ matches any character except a slash (/).

       o      a  ‘[’  introduces  a  character  class,  such   as   [a-z]   or
              [[:alpha:]].

       o      in  a  wildcard  pattern,  a  backslash  can be used to escape a
              wildcard  character,  but  it  is  matched  literally  when   no
              wildcards are present.

       o      if  the  pattern  contains  a / (not counting a trailing /) or a
              “**”, then it is matched against the  full  pathname,  including
              any leading directories. If the pattern doesn’t contain a / or a
              “**”, then it is matched only against the final component of the
              filename.   (Remember  that the algorithm is applied recursively
              so “full filename” can actually be any portion of  a  path  from
              the starting directory on down.)

       o      a  trailing  “dir_name/***” will match both the directory (as if
              “dir_name/” had been specified) and everything in the  directory
              (as  if  “dir_name/**”  had  been specified).  This behavior was
              added in version 2.6.7.

       Note that, when using the --recursive (-r) option (which is implied  by
       -a),  every subcomponent of every path is visited from the top down, so
       include/exclude patterns get applied recursively to each subcomponent’s
       full  name (e.g. to include “/foo/bar/baz” the subcomponents “/foo” and
       “/foo/bar” must not be excluded).  The exclude patterns actually short-
       circuit  the  directory  traversal  stage when rsync finds the files to
       send.  If a pattern excludes a  particular  parent  directory,  it  can
       render  a  deeper  include  pattern  ineffectual  because rsync did not
       descend through that  excluded  section  of  the  hierarchy.   This  is
       particularly  important  when using a trailing ‘*’ rule.  For instance,
       this won’t work:

              + /some/path/this-file-will-not-be-found
              + /file-is-included
              - *

       This fails because the parent directory “some” is excluded by  the  ‘*’
       rule,  so  rsync  never  visits  any  of  the  files  in  the “some” or
       “some/path” directories.  One solution is to ask for all directories in
       the  hierarchy  to  be  included by using a single rule: “+ */” (put it
       somewhere   before   the   “-   *”   rule),   and   perhaps   use   the
       --prune-empty-dirs option.  Another solution is to add specific include
       rules for all the parent dirs that need to be visited.   For  instance,
       this set of rules works fine:

              + /some/
              + /some/path/
              + /some/path/this-file-is-found
              + /file-also-included
              - *

       Here are some examples of exclude/include matching:

       o      “- *.o” would exclude all names matching *.o

       o      “-  /foo”  would  exclude a file (or directory) named foo in the
              transfer-root directory

       o      “- foo/” would exclude any directory named foo

       o      “- /foo/*/bar” would exclude any file named bar which is at  two
              levels   below  a  directory  named  foo  in  the  transfer-root
              directory

       o      “- /foo/**/bar” would exclude any file named  bar  two  or  more
              levels   below  a  directory  named  foo  in  the  transfer-root
              directory

       o      The combination of “+ */”, “+ *.c”, and “- *” would include  all
              directories  and  C  source files but nothing else (see also the
              --prune-empty-dirs option)

       o      The combination of “+ foo/”, “+  foo/bar.c”,  and  “-  *”  would
              include  only the foo directory and foo/bar.c (the foo directory
              must be explicitly included or it would be excluded by the “*”)

MERGE-FILE FILTER RULES

       You can merge whole files into your filter rules by specifying either a
       merge  (.)  or a dir-merge (:) filter rule (as introduced in the FILTER
       RULES section above).

       There are two kinds of merged files — single-instance  (‘.’)  and  per-
       directory  (‘:’).   A  single-instance merge file is read one time, and
       its rules are incorporated into the filter list in the place of the “.”
       rule.   For  per-directory merge files, rsync will scan every directory
       that it traverses for the named file, merging  its  contents  when  the
       file  exists  into  the  current  list  of inherited rules.  These per-
       directory rule files must be created on the sending side because it  is
       the  sending  side  that  is  being  scanned for the available files to
       transfer.  These rule files may also need  to  be  transferred  to  the
       receiving  side if you want them to affect what files don’t get deleted
       (see PER-DIRECTORY RULES AND DELETE below).

       Some examples:

              merge /etc/rsync/default.rules
              . /etc/rsync/default.rules
              dir-merge .per-dir-filter
              dir-merge,n- .non-inherited-per-dir-excludes
              :n- .non-inherited-per-dir-excludes

       The following modifiers are accepted after a merge or dir-merge rule:

       o      A - specifies that the  file  should  consist  of  only  exclude
              patterns,   with   no  other  rule-parsing  except  for  in-file
              comments.

       o      A + specifies that the  file  should  consist  of  only  include
              patterns,   with   no  other  rule-parsing  except  for  in-file
              comments.

       o      A C is a way to specify that the file should be read in  a  CVS-
              compatible  manner.   This  turns on ‘n’, ‘w’, and ’-’, but also
              allows the list-clearing token  (!)  to  be  specified.   If  no
              filename is provided, “.cvsignore” is assumed.

       o      A  e  will  exclude  the merge-file name from the transfer; e.g.
              “dir-merge,e .rules” is like “dir-merge .rules” and “-  .rules”.

       o      An   n   specifies   that   the   rules  are  not  inherited  by
              subdirectories.

       o      A w specifies  that  the  rules  are  word-split  on  whitespace
              instead  of  the  normal  line-splitting.   This  also turns off
              comments.  Note: the space that separates the  prefix  from  the
              rule  is  treated  specially,  so “- foo + bar” is parsed as two
              rules (assuming that prefix-parsing wasn’t also disabled).

       o      You may also specify any of the modifiers for  the  “+”  or  “-”
              rules  (below)  in order to have the rules that are read in from
              the file default to having that  modifier  set.   For  instance,
              “merge,-/  .excl” would treat the contents of .excl as absolute-
              path excludes, while “dir-merge,s .filt” and  “:sC”  would  each
              make  all  their  per-directory  rules apply only on the sending
              side.

       The following modifiers are accepted after a “+” or “-”:

       o      A / specifies that the include/exclude rule  should  be  matched
              against the absolute pathname of the current item.  For example,
              “-/ /etc/passwd” would exclude the  passwd  file  any  time  the
              transfer  was  sending  files from the “/etc” directory, and “-/
              subdir/foo” would always exclude “foo” when it is in a dir named
              “subdir”,  even if “foo” is at the root of the current transfer.

       o      A ! specifies that the include/exclude should take effect if the
              pattern fails to match.  For instance, “-! */” would exclude all
              non-directories.

       o      A C is used to indicate that all the  global  CVS-exclude  rules
              should  be  inserted  as  excludes in place of the “-C”.  No arg
              should follow.

       o      An s is used to indicate that the rule applies  to  the  sending
              side.   When  a rule affects the sending side, it prevents files
              from being transferred.  The default is for  a  rule  to  affect
              both sides unless --delete-excluded was specified, in which case
              default rules become sender-side only.  See also  the  hide  (H)
              and  show  (S)  rules,  which  are  an  alternate way to specify
              sending-side includes/excludes.

       o      An r is used to indicate that the rule applies to the  receiving
              side.  When a rule affects the receiving side, it prevents files
              from being deleted.  See the s modifier for more info.  See also
              the  protect  (P) and risk (R) rules, which are an alternate way
              to specify receiver-side includes/excludes.

       o      A p indicates that a rule is  perishable,  meaning  that  it  is
              ignored  in  directories  that are being deleted.  For instance,
              the -C option’s default rules that exclude things like “CVS” and
              “*.o” are marked as perishable, and will not prevent a directory
              that was removed  on  the  source  from  being  deleted  on  the
              destination.

       Per-directory   rules  are  inherited  in  all  subdirectories  of  the
       directory where the merge-file was found unless the  ‘n’  modifier  was
       used.   Each  subdirectory’s  rules  are prefixed to the inherited per-
       directory rules from its parents, which gives the newest rules a higher
       priority  than  the inherited rules.  The entire set of dir-merge rules
       are grouped together in the spot where the merge-file was specified, so
       it  is  possible  to  override  dir-merge  rules  via  a  rule that got
       specified earlier in the list of global rules.  When the  list-clearing
       rule  (“!”)  is  read  from  a  per-directory  file, it only clears the
       inherited rules for the current merge file.

       Another way to prevent a single rule from a dir-merge file  from  being
       inherited  is  to  anchor it with a leading slash.  Anchored rules in a
       per-directory merge-file are relative to the merge-file’s directory, so
       a pattern “/foo” would only match the file “foo” in the directory where
       the dir-merge filter file was found.

       Here’s an example filter  file  which  you’d  specify  via  --filter=".
       file":

              merge /home/user/.global-filter
              - *.gz
              dir-merge .rules
              + *.[ch]
              - *.o

       This  will  merge the contents of the /home/user/.global-filter file at
       the start of the list and also turns the “.rules” filename into a  per-
       directory  filter  file.   All  rules read in prior to the start of the
       directory scan follow the global anchoring rules (i.e. a leading  slash
       matches at the root of the transfer).

       If a per-directory merge-file is specified with a path that is a parent
       directory of the first transfer directory,  rsync  will  scan  all  the
       parent  dirs from that starting point to the transfer directory for the
       indicated per-directory file.  For instance, here is  a  common  filter
       (see -F):

              --filter=’: /.rsync-filter’

       That  rule  tells  rsync  to  scan  for  the  file .rsync-filter in all
       directories from the root down through  the  parent  directory  of  the
       transfer prior to the start of the normal directory scan of the file in
       the directories that are sent as a part of the transfer.  (Note: for an
       rsync daemon, the root is always the same as the module’s “path”.)

       Some examples of this pre-scanning for per-directory files:

              rsync -avF /src/path/ /dest/dir
              rsync -av --filter=’: ../../.rsync-filter’ /src/path/ /dest/dir
              rsync -av --filter=’: .rsync-filter’ /src/path/ /dest/dir

       The  first  two commands above will look for “.rsync-filter” in “/” and
       “/src”  before  the  normal  scan  begins  looking  for  the  file   in
       “/src/path”  and  its  subdirectories.   The  last  command  avoids the
       parent-dir scan and only looks for the “.rsync-filter”  files  in  each
       directory that is a part of the transfer.

       If you want to include the contents of a “.cvsignore” in your patterns,
       you should use  the  rule  “:C”,  which  creates  a  dir-merge  of  the
       .cvsignore  file,  but  parsed in a CVS-compatible manner.  You can use
       this to affect where the --cvs-exclude (-C) option’s inclusion  of  the
       per-directory  .cvsignore  file  gets placed into your rules by putting
       the “:C” wherever you like in your filter rules.  Without  this,  rsync
       would  add the dir-merge rule for the .cvsignore file at the end of all
       your other rules (giving it a lower  priority  than  your  command-line
       rules).  For example:

              cat <<EOT | rsync -avC --filter=’. -’ a/ b
              + foo.o
              :C
              - *.old
              EOT
              rsync -avC --include=foo.o -f :C --exclude=’*.old’ a/ b

       Both  of  the  above rsync commands are identical.  Each one will merge
       all the per-directory .cvsignore rules in the middle of the list rather
       than at the end.  This allows their dir-specific rules to supersede the
       rules that follow the :C instead  of  being  subservient  to  all  your
       rules.  To affect the other CVS exclude rules (i.e. the default list of
       exclusions,  the  contents  of  $HOME/.cvsignore,  and  the  value   of
       $CVSIGNORE)  you  should  omit  the  -C command-line option and instead
       insert a “-C” rule into your filter rules; e.g. “--filter=-C”.

LIST-CLEARING FILTER RULE

       You can clear the current include/exclude list by using the “!”  filter
       rule  (as introduced in the FILTER RULES section above).  The “current”
       list is either the global list of rules (if  the  rule  is  encountered
       while  parsing  the  filter  options)  or  a set of per-directory rules
       (which are inherited in their own sub-list, so a subdirectory  can  use
       this to clear out the parent’s rules).

ANCHORING INCLUDE/EXCLUDE PATTERNS

       As  mentioned  earlier, global include/exclude patterns are anchored at
       the “root of the transfer” (as opposed to per-directory patterns, which
       are  anchored  at  the  merge-file’s  directory).   If you think of the
       transfer as a subtree of names that  are  being  sent  from  sender  to
       receiver,  the  transfer-root is where the tree starts to be duplicated
       in the destination directory.  This root governs  where  patterns  that
       start with a / match.

       Because  the  matching  is  relative to the transfer-root, changing the
       trailing slash on a source path or changing your use of the  --relative
       option  affects  the path you need to use in your matching (in addition
       to changing how much of the file tree is duplicated on the  destination
       host).  The following examples demonstrate this.

       Let’s  say that we want to match two source files, one with an absolute
       path of “/home/me/foo/bar”, and one with a path of “/home/you/bar/baz”.
       Here is how the various command choices differ for a 2-source transfer:

              Example cmd: rsync -a /home/me /home/you /dest
              +/- pattern: /me/foo/bar
              +/- pattern: /you/bar/baz
              Target file: /dest/me/foo/bar
              Target file: /dest/you/bar/baz

              Example cmd: rsync -a /home/me/ /home/you/ /dest
              +/- pattern: /foo/bar               (note missing “me”)
              +/- pattern: /bar/baz               (note missing “you”)
              Target file: /dest/foo/bar
              Target file: /dest/bar/baz

              Example cmd: rsync -a --relative /home/me/ /home/you /dest
              +/- pattern: /home/me/foo/bar       (note full path)
              +/- pattern: /home/you/bar/baz      (ditto)
              Target file: /dest/home/me/foo/bar
              Target file: /dest/home/you/bar/baz

              Example cmd: cd /home; rsync -a --relative me/foo you/ /dest
              +/- pattern: /me/foo/bar      (starts at specified path)
              +/- pattern: /you/bar/baz     (ditto)
              Target file: /dest/me/foo/bar
              Target file: /dest/you/bar/baz

       The easiest way to see what name you should filter is to just  look  at
       the  output  when using --verbose and put a / in front of the name (use
       the --dry-run option if you’re not yet ready to copy any files).

PER-DIRECTORY RULES AND DELETE

       Without a delete option, per-directory rules are only relevant  on  the
       sending  side,  so  you  can  feel  free  to  exclude  the  merge files
       themselves without affecting the transfer.  To make this easy, the  ‘e’
       modifier  adds  this  exclude  for you, as seen in these two equivalent
       commands:

              rsync -av --filter=’: .excl’ --exclude=.excl host:src/dir /dest
              rsync -av --filter=’:e .excl’ host:src/dir /dest

       However, if you want to do a delete on the receiving side AND you  want
       some  files  to  be excluded from being deleted, you’ll need to be sure
       that the receiving side knows what files to exclude.  The  easiest  way
       is  to  include  the  per-directory merge files in the transfer and use
       --delete-after, because this ensures that the receiving side  gets  all
       the  same  exclude  rules as the sending side before it tries to delete
       anything:

              rsync -avF --delete-after host:src/dir /dest

       However, if the merge files are not a part of the transfer, you’ll need
       to  either  specify  some  global  exclude rules (i.e. specified on the
       command line), or you’ll need to maintain your own per-directory  merge
       files  on  the receiving side.  An example of the first is this (assume
       that the remote .rules files exclude themselves):

       rsync -av --filter=’: .rules’ --filter=’. /my/extra.rules’
          --delete host:src/dir /dest

       In the above example the extra.rules file can affect both sides of  the
       transfer,  but  (on  the sending side) the rules are subservient to the
       rules merged from the .rules files because they  were  specified  after
       the per-directory merge rule.

       In  one  final  example, the remote side is excluding the .rsync-filter
       files from the transfer, but we want to use our own .rsync-filter files
       to control what gets deleted on the receiving side.  To do this we must
       specifically exclude the per-directory merge files (so that they  don’t
       get  deleted)  and  then put rules into the local files to control what
       else should not get deleted.  Like one of these commands:

           rsync -av --filter=’:e /.rsync-filter’ --delete \
               host:src/dir /dest
           rsync -avFF --delete host:src/dir /dest

BATCH MODE

       Batch mode can be used to  apply  the  same  set  of  updates  to  many
       identical  systems.  Suppose  one  has  a tree which is replicated on a
       number of hosts.  Now suppose some  changes  have  been  made  to  this
       source tree and those changes need to be propagated to the other hosts.
       In order to do this using batch mode, rsync is run with the write-batch
       option  to  apply  the  changes  made  to the source tree to one of the
       destination trees.  The write-batch option causes the rsync  client  to
       store  in  a  “batch  file”  all  the information needed to repeat this
       operation against other, identical destination trees.

       To apply the recorded changes to another destination  tree,  run  rsync
       with the read-batch option, specifying the name of the same batch file,
       and the destination tree.  Rsync updates the destination tree using the
       information stored in the batch file.

       For  convenience,  one additional file is creating when the write-batch
       option is used.  This file’s name is created by appending “.sh” to  the
       batch  filename.   The  .sh  file  contains a command-line suitable for
       updating a destination tree using that batch file. It can  be  executed
       using  a  Bourne  (or  Bourne-like)  shell,  optionally  passing  in an
       alternate destination tree pathname which is then used instead  of  the
       original  path.  This  is useful when the destination tree path differs
       from the original destination tree path.

       Generating the batch file once saves having to perform the file status,
       checksum,  and  data  block  generation  more  than  once when updating
       multiple destination trees. Multicast transport protocols can  be  used
       to  transfer  the batch update files in parallel to many hosts at once,
       instead of sending the same data to every host individually.

       Examples:

              $ rsync --write-batch=foo -a host:/source/dir/ /adest/dir/
              $ scp foo* remote:
              $ ssh remote ./foo.sh /bdest/dir/

              $ rsync --write-batch=foo -a /source/dir/ /adest/dir/
              $ ssh remote rsync --read-batch=- -a /bdest/dir/ <foo

       In  these  examples,  rsync  is  used  to   update   /adest/dir/   from
       /source/dir/  and the information to repeat this operation is stored in
       “foo” and “foo.sh”.  The host “remote” is then updated with the batched
       data  going into the directory /bdest/dir.  The differences between the
       two examples reveals some of the flexibility you have in how  you  deal
       with batches:

       o      The first example shows that the initial copy doesn’t have to be
              local — you can push or pull data to/from a  remote  host  using
              either  the  remote-shell  syntax  or  rsync  daemon  syntax, as
              desired.

       o      The first example uses the created  “foo.sh”  file  to  get  the
              right  rsync  options when running the read-batch command on the
              remote host.

       o      The second example reads the batch data via  standard  input  so
              that  the  batch  file  doesn’t  need to be copied to the remote
              machine first.  This example avoids the foo.sh script because it
              needed to use a modified --read-batch option, but you could edit
              the script file if you wished to make use of it  (just  be  sure
              that  no  other  option is trying to use standard input, such as
              the “--exclude-from=-” option).

       Caveats:

       The read-batch option expects the destination tree that it is  updating
       to  be  identical  to  the destination tree that was used to create the
       batch update fileset.  When a difference between the destination  trees
       is  encountered  the  update  might be discarded with a warning (if the
       file appears to be  up-to-date  already)  or  the  file-update  may  be
       attempted  and  then, if the file fails to verify, the update discarded
       with an error.  This means that it should be safe  to  re-run  a  read-
       batch  operation  if the command got interrupted.  If you wish to force
       the batched-update to always be attempted regardless of the file’s size
       and  date,  use  the  -I  option (when reading the batch).  If an error
       occurs, the destination tree will probably be in  a  partially  updated
       state.  In that case, rsync can be used in its regular (non-batch) mode
       of operation to fix up the destination tree.

       The rsync version used on all destinations must be at least as  new  as
       the  one used to generate the batch file.  Rsync will die with an error
       if the protocol version in the batch file is too  new  for  the  batch-
       reading  rsync  to handle.  See also the --protocol option for a way to
       have the creating rsync generate a batch file that an older  rsync  can
       understand.  (Note that batch files changed format in version 2.6.3, so
       mixing versions older than that with newer versions will not work.)

       When reading a batch file,  rsync  will  force  the  value  of  certain
       options  to  match the data in the batch file if you didn’t set them to
       the same as the batch-writing command.  Other options can (and  should)
       be  changed.   For  instance  --write-batch  changes  to  --read-batch,
       --files-from is dropped, and the  --filter/--include/--exclude  options
       are not needed unless one of the --delete options is specified.

       The    code   that   creates   the   BATCH.sh   file   transforms   any
       filter/include/exclude options into a single list that is appended as a
       “here”  document  to  the  shell script file.  An advanced user can use
       this to modify the exclude list if a change in  what  gets  deleted  by
       --delete is desired.  A normal user can ignore this detail and just use
       the shell script as an easy way to  run  the  appropriate  --read-batch
       command for the batched data.

       The  original batch mode in rsync was based on “rsync+”, but the latest
       version uses a new implementation.

SYMBOLIC LINKS

       Three basic behaviors are possible when  rsync  encounters  a  symbolic
       link in the source directory.

       By  default,  symbolic  links  are  not  transferred at all.  A message
       “skipping non-regular” file is emitted for any symlinks that exist.

       If --links is specified, then symlinks  are  recreated  with  the  same
       target on the destination.  Note that --archive implies --links.

       If  --copy-links is specified, then symlinks are “collapsed” by copying
       their referent, rather than the symlink.

       rsync also  distinguishes  “safe”  and  “unsafe”  symbolic  links.   An
       example  where  this  might  be  used  is a web site mirror that wishes
       ensure the rsync module they copy does not include  symbolic  links  to
       /etc/passwd    in    the   public   section   of   the   site.    Using
       --copy-unsafe-links will cause any links to be copied as the file  they
       point  to  on  the  destination.   Using --safe-links will cause unsafe
       links to be omitted altogether.  (Note that you  must  specify  --links
       for --safe-links to have any effect.)

       Symbolic  links  are  considered  unsafe  if they are absolute symlinks
       (start with /), empty, or if they contain enough  “..”   components  to
       ascend from the directory being copied.

       Here’s  a summary of how the symlink options are interpreted.  The list
       is in order of precedence, so if  your  combination  of  options  isn’t
       mentioned,  use  the  first  line  that  is  a  complete subset of your
       options:

       --copy-links
              Turn all symlinks into normal files (leaving no symlinks for any
              other options to affect).

       --links --copy-unsafe-links
              Turn  all  unsafe  symlinks  into  files  and duplicate all safe
              symlinks.

       --copy-unsafe-links
              Turn all unsafe symlinks  into  files,  noisily  skip  all  safe
              symlinks.

       --links --safe-links
              Duplicate safe symlinks and skip unsafe ones.

       --links
              Duplicate all symlinks.

DIAGNOSTICS

       rsync  occasionally  produces  error  messages  that  may seem a little
       cryptic. The one that seems to cause the most  confusion  is  “protocol
       version mismatch — is your shell clean?”.

       This  message is usually caused by your startup scripts or remote shell
       facility producing unwanted garbage on the stream that rsync  is  using
       for  its  transport.  The  way  to diagnose this problem is to run your
       remote shell like this:

              ssh remotehost /bin/true > out.dat

       then look at out.dat. If everything is working correctly  then  out.dat
       should  be  a zero length file. If you are getting the above error from
       rsync then you will probably find that out.dat contains  some  text  or
       data.  Look  at  the contents and try to work out what is producing it.
       The most common cause is incorrectly configured shell  startup  scripts
       (such  as  .cshrc  or .profile) that contain output statements for non-
       interactive logins.

       If  you  are  having  trouble  debugging  filter  patterns,  then   try
       specifying  the -vv option.  At this level of verbosity rsync will show
       why each individual file is included or excluded.

EXIT VALUES

       0      Success

       1      Syntax or usage error

       2      Protocol incompatibility

       3      Errors selecting input/output files, dirs

       4      Requested  action  not  supported:  an  attempt  was   made   to
              manipulate  64-bit files on a platform that cannot support them;
              or an option was specified that is supported by the  client  and
              not by the server.

       5      Error starting client-server protocol

       6      Daemon unable to append to log-file

       10     Error in socket I/O

       11     Error in file I/O

       12     Error in rsync protocol data stream

       13     Errors with program diagnostics

       14     Error in IPC code

       20     Received SIGUSR1 or SIGINT

       21     Some error returned by waitpid()

       22     Error allocating core memory buffers

       23     Partial transfer due to error

       24     Partial transfer due to vanished source files

       25     The --max-delete limit stopped deletions

       30     Timeout in data send/receive

       35     Timeout waiting for daemon connection

ENVIRONMENT VARIABLES

       CVSIGNORE
              The   CVSIGNORE  environment  variable  supplements  any  ignore
              patterns in .cvsignore files. See the --cvs-exclude  option  for
              more details.

       RSYNC_ICONV
              Specify   a  default  --iconv  setting  using  this  environment
              variable.

       RSYNC_RSH
              The RSYNC_RSH environment variable allows you  to  override  the
              default  shell  used  as  the transport for rsync.  Command line
              options are permitted after the command name, just as in the  -e
              option.

       RSYNC_PROXY
              The RSYNC_PROXY environment variable allows you to redirect your
              rsync client to use a web  proxy  when  connecting  to  a  rsync
              daemon. You should set RSYNC_PROXY to a hostname:port pair.

       RSYNC_PASSWORD
              Setting  RSYNC_PASSWORD  to  the required password allows you to
              run authenticated rsync connections to an rsync  daemon  without
              user  intervention. Note that this does not supply a password to
              a remote shell transport such as ssh; to learn how to  do  that,
              consult the remote shell’s documentation.

       USER or LOGNAME
              The  USER or LOGNAME environment variables are used to determine
              the default username sent to an rsync  daemon.   If  neither  is
              set, the username defaults to “nobody”.

       HOME   The HOME environment variable is used to find the user’s default
              .cvsignore file.

FILES

       /etc/rsyncd.conf or rsyncd.conf

SEE ALSO

       rsyncd.conf(5)

BUGS

       times are transferred as *nix time_t values

       When transferring to  FAT  filesystems  rsync  may  re-sync  unmodified
       files.  See the comments on the --modify-window option.

       file  permissions,  devices,  etc.  are transferred as native numerical
       values

       see also the comments on the --delete option

       Please report bugs! See the web site at http://rsync.samba.org/

VERSION

       This man page is current for version 3.0.5 of rsync.

INTERNAL OPTIONS

       The options --server and --sender are used  internally  by  rsync,  and
       should  never  be  typed  by  a  user under normal circumstances.  Some
       awareness of these options may be needed in certain scenarios, such  as
       when  setting  up  a  login  that  can  only run an rsync command.  For
       instance, the support  directory  of  the  rsync  distribution  has  an
       example  script  named  rrsync  (for restricted rsync) that can be used
       with a restricted ssh login.

CREDITS

       rsync is distributed under  the  GNU  public  license.   See  the  file
       COPYING for details.

       A  WEB site is available at http://rsync.samba.org/.  The site includes
       an FAQ-O-Matic which may cover  questions  unanswered  by  this  manual
       page.

       The primary ftp site for rsync is ftp://rsync.samba.org/pub/rsync.

       We  would  be  delighted  to  hear  from  you if you like this program.
       Please contact the mailing-list at rsync@lists.samba.org.

       This program uses the excellent zlib  compression  library  written  by
       Jean-loup Gailly and Mark Adler.

THANKS

       Especial  thanks  go  out to: John Van Essen, Matt McCutchen, Wesley W.
       Terpstra, David Dykstra, Jos Backus, Sebastian  Krahmer,  Martin  Pool,
       and our gone-but-not-forgotten compadre, J.W. Schultz.

       Thanks  also  to  Richard  Brent,  Brendan  Mackay, Bill Waite, Stephen
       Rothwell  and  David  Bell.   I’ve  probably  missed  some  people,  my
       apologies if I have.

AUTHOR

       rsync  was  originally  written  by Andrew Tridgell and Paul Mackerras.
       Many people have later contributed to it.  It is  currently  maintained
       by Wayne Davison.

       Mailing   lists   for   support   and   development  are  available  at
       http://lists.samba.org

                                  28 Dec 2008                         rsync(1)