prerm is in nagios3-dbg 3.5.1.dfsg-2.1ubuntu8.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh -e
if [ "$1" != "upgrade" ]; then
update-alternatives --remove mini_epn /usr/bin/mini_epn_nagios3
fi
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