/BY_OWNER[=uic]

    Selects only those files whose owner user identification code
    (UIC) matches the specified owner UIC. The default UIC is that of
    the current process.

    Specify the UIC by using standard UIC format as described in the
    VSI OpenVMS Guide to System Security.

                                   NOTE

       Using this qualifier with DELETE/TREE command results in an
       error.