/USER=user-spec

    Specifies one or more users whose identifiers are to be listed.
    The user-spec can be a user name or UIC. You can use the
    asterisk wildcard character (*) to specify multiple user names
    or UICs. UICs must be in the form [*,*], [n,*], [*,n], or
    [n,n]. A wildcard user name specification (*)  lists identifiers
    alphabetically by user name; a wildcard UIC specification ([*,*])
    lists them numerically by UIC.