Dupliquer un dossier en conservant les attributs (droits, ACL, heures, …)

cp -R -p /Volumes/Os\ X/Users/germain/ /Volumes/iMac/germain

D’après le man :

-p    Cause cp to preserve the following attributes of each source file in the copy: modification
           time, access time, file flags, file mode, user ID, and group ID, as allowed by permissions.
           Access Control Lists (ACLs) will also be preserved.

           If the user ID and group ID cannot be preserved, no error message is displayed and the exit
           value is not altered.

           If the source file has its set-user-ID bit on and the user ID cannot be preserved, the set-
           user-ID bit is not preserved in the copy's permissions.  If the source file has its set-
           group-ID bit on and the group ID cannot be preserved, the set-group-ID bit is not preserved
           in the copy's permissions.  If the source file has both its set-user-ID and set-group-ID bits
           on, and either the user ID or group ID cannot be preserved, neither the set-user-ID nor set-
           group-ID bits are preserved in the copy's permissions.

     -R    If source_file designates a directory, cp copies the directory and the entire subtree con-
           nected at that point.