Quoting from the apt-get.8 man page:
--force-yes
Force yes; This is a dangerous option that will cause apt to
continue without prompting if it is doing something potentially
harmful. It should not be used except in very special situa-
tions. Using force-yes can potentially destroy your system! Con-
figuration Item: APT::Get::force-yes.
As this warnin is quite loud, IMHO, passing --force-yes would be a
dangerous thing.
Although the apt-zip-list script generates a download list, it might
produce a broken set of debs which might induce problems when
apt-zip-inst will be ran.
Adding --force-yes to -list would imply later the addition of
--force-yes to -inst, too.
While -list might be harmless, zpt-zip-inst could induce system breakage.
Imagine that the -list command would solve a depndency by downgrading
libc, and -inst would pass also --force-yes; in that case the whole
system would break. This is, of course, an extreme scenario, but it
might give an impression about the danger of --force-yes option.
Before setting tag "wontfix" I would like to discuss the possibility
of adding an option that would make apt-get to be called with
--force-yes within the -list script. I would be against calling -inst
also, but given enough safety net for this, might be ok.
--
Regards,
EddyP
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"Imagination is more important than knowledge" A.Einstein