/USER=user-spec

    Specifies one or more users whose identifiers are to be listed.
    The user-spec can be a user name or a 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 ([*,*]) displays all identifiers held by users.
    The wildcard user name specification displays holders' user names
    alphabetically; the wildcard UIC specification displays them in
    the numerical order of their UICs.