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Langue: en

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Version: 20 June 2010 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)


mddiff - computes diff for maildirs


 mddiff [--max-mailno mno] [--db-file dbf] 
        [-v|--verbose] [-d|--dry-run] [--help] paths


mddiff computes the delta from an old status of a maildir (previously recorded in a support file, called db file) and the current status, generating a set of commands (a diff) that a third party software can apply to synchronize a (eventually remote) copy of the maildir.

If paths is a single file name, and that file is a fifo, mddiff reads from it file names separated by new line and outputs the sha1 of its header and body separated by space.

       $ mddiff /tmp/fifo_for_mddiff 
       806a0ffe4f29766effd764... 463e543da9dac8e298...
       582cbb6a5cd3ce13965c8c... 8fa60a7458b1157193...
If paths is a list of directories, mddiff outputs a list of actions a client has to perform to synchronize a copy of the same maildirs. This set of actions is relative to a previous status of the maildir stored in the db file. The input directories are traversed recursively, and every file encountered inside directories named cur/ and new/ is a potential mail message (if it contains no \n\n it is skipped).
       $ mddiff ~/Mail/
       ADD ~/Mail/cur/1239038050.14937_1.garfield:2,S 66532ebb05b252e... 
Every client (endpoint using mddiff for synchronization) must use a different db-file, and the db-file is strictly related with the set of directories given as arguments, and should not be used with a different directory set. Adding items to the directory set is safe, while removing them may not do what you want (delete actions are generated).

mddiff does not alter the dbf file, it generates a new one called It is up to the higher level tool smd-server(1) to rename to dbf in case the other endpoint successfully applied the diff.


--max-mailno mno
Estimation of max mail message number (default 500000) Decrease for small systems, it is increased automatically if needed
--db-file dbf
Name of the cache for the endpoint (default db.txt)
-v --verbose
Increase program verbosity (printed on stderr)
-d --dry-run
Do not generate a new db-file
This help screen


mddiff is a low level utility, used by smd-server and smd-client. You should use higher level tools like smd-pull(1), smd-push(1) and smd-loop(1)


smd-client(1), smd-server(1), smd-pull(1), smd-push(1), smd-loop(1)


Enrico Tassi <>
Quand l'absurde est outré, l'on lui fait trop d'honneur
De vouloir par raison combattre son erreur ;
Enchérir est plus court, sans s'échauffer la bile.
-+- Jean de La Fontaine (1621-1695),
Le Dépositaire infidèle (Fables IX.1) -+-