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files on standard input as an mtree(8) `specfile' specification, and write or copy only those items in the specfile. If the file exists in the underlying file system, its permissions and modification time will be used unless specifically overridden by the specfile. An error will be raised if the type of entry in the specfile conflicts with that of an existing file. Otherwise, it is necessary to specify at least the following parameters in the specfile: type, mode, gname or gid, and uname or uid, device (in the case of block or character devices), and link (in the case of symbolic links). If time isn't provided, the current time will be used.