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Version: September 23, 2001 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)


unison-2.27.57 - a file-synchronization tool for Unix and Windows


unison-2.27.57 [options]
unison-2.27.57 root1 root2 [options]
unison-2.27.57 profilename [options]
unison-2.27.57-gtk [options]


This manual page briefly documents Unison, and was written for the Debian GNU/Linux distribution because the original program does not have a manual page. For a full description, please refer to the inbuilt documentation or the manuals in /usr/share/doc/unison2.27.57/. The unison-2.27.57-gtk binary has similar command-line options, but allows the user to select and create profiles and configure options from within the program.

Unison is a file-synchronization tool for Unix and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other.

Unison offers several advantages over various synchronization methods such as CVS, Coda, rsync, Intellisync, etc. Unison can run on and synchronize between Windows and many UNIX platforms. Unison requires no root privileges, system access or kernel changes to function. Unison can synchronize changes to files and directories in both directions, on the same machine, or across a network using ssh or a direct socket connection.

Transfers are optimised using a version of the rsync protocol, making it ideal for slower links. Unison has a clear and precise specification, and is resilient to failure due to its careful handling of the replicas and its private structures.


All Unison options are long, starting with one dash (`-') only. A summary of options is included here. For a complete description, see the inbuilt documentation or the manuals in /usr/share/doc/unison2.27.57/.
specify a file to add new preferences to in interactive mode
add version number to name of unison-2.27.57 executable on server
automatically accept default actions
-backup xxx
add a regexp to the backup list
keep backup copies of files (deprecated: use 'backup')
batch mode: ask no questions at all
suppress the 'contacting server' message during startup
-debug xxx
debug module xxx ('all' -> everything, 'verbose' -> more)
-doc xxx
show documentation ('-doc topics' lists topics)
do not try to change terminal settings in text UI
-editor xxx
command for displaying the output of the -merge program
do fast (and slightly unsafe) update detection on windows
-follow xxx
add a regexp to the follow list
-force xxx
force changes from this replica to the other
synchronize group
-height n
height (in lines) of main window in graphical interface
-ignore xxx
add a regexp to the ignore list
ignore upper/lowercase spelling of filenames
-ignorenot xxx
add a regexp to the ignorenot list
kill server when done (even when using sockets)
record actions in file specified by logfile preference
-logfile xxx
log file name
-maxbackups n
number of backed up versions of a file to keep
-merge xxx
command for merging conflicting files
-merge2 xxx
command for merging files (when no common version exists)
don't map uid/gid values by user/group names
synchronize owner
-path xxx
path to synchronize
-perms n
part of the permissions which is synchronized
-prefer xxx
choose this replica's version in case of conflict
-root xxx
root of a replica
-rootalias xxx
register alias for canonical root names
-rshargs xxx
other arguments (if any) for remote shell command
-rshcmd xxx
path to the rsh executable
-servercmd xxx
name of unison executable on remote server
print nothing (except error messages)
-socket xxx
act as a server on a socket
list changed files by size, not name
-sortfirst xxx
add a regexp to the sortfirst list
-sortlast xxx
add a regexp to the sortlast list
list new before changed files
-sshcmd xxx
path to the ssh executable
-statusdepth n
status display depth for local files
suppress status messages
exit immediately after the connection to the server
synchronize modification times
-ui xxx
select user interface ('text' or 'graphic')
print version and exit

Some preferences are just boolean flags. Others take numeric or string arguments, indicated in the preferences list by n or xxx. Most of the string preferences can be given several times; the arguments are accumulated into a list internally.


The program is documented fully in the in-built documentation and the manual, available as text in /usr/share/doc/unison2.27.57/.


This manual page was written by Robert McQueen <>, for the Debian GNU/Linux system (but may be used by others).
Il n'est désir plus naturel que le désir de cognoissance.
-+- Michel de Montaigne -+-