Library /sys$common/syshlp/sysmanhelp.hlb STARTUP, DISABLE, Qualifiers, /CONFIRM  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /CONFIRM
       /NOCONFIRM (default)

    Controls whether the STARTUP DISABLE command displays the file
    specification of each file before disabling it in the startup
    database and requests you to confirm that the file be disabled.
    If you specify /CONFIRM, you must respond to the prompt with a Y
    (Yes) or a T (True) and press Return before the file is disabled.
    If you enter anything else, such as N or No, the requested file
    is not disabled.