/USER=user-spec

    Specifies a user 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 UICs or all user names. UICs
    must be in the form [*,*], [n,*], [*,n], or [n,n]. A wildcard
    user name specification (*)  or wildcard UIC specification
    ([*,*]) lists all identifiers held by users. The wildcard user
    name specification lists holders' user names alphabetically; the
    wildcard UIC specification lists them in the numerical order of
    their UICs.