bailing out of a build in install/uninstall script

[rpjday <rpjday mindspring com>]

  according to "maximum rpm", there is a way in, say, a %pre or %preun
script in which you can decide to not proceed with the install or
removal, but it doesn't mention what that is.

  is it as simple as doing an "exit 0" in the middle of that
script?

rday