rsync错误捕获 shell捕获返回码

因工作需要，因为要判断rsync是否成功，一开始我是判断本地文件有没有到，这样做相当安全，现在要把数据PUSH过去，我就没法判断了，只能用rsync的返回状态吗，一开始直接把`rsync ....`赋给了一个值，SHELL里不是这样地

 rsync xxx yyy
 ret=$?
 if [ $ret -ne 0 ]; then
     echo "失败, 错误码: $ret"
 fi

 付上rsync常用的错误代码：
        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