prerm is in g++ 4:4.6.3-1ubuntu5.
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 6 7 8 9 | #! /bin/sh -e
if [ $1 != "upgrade" ]; then
update-alternatives --remove c++ /usr/bin/g++
fi
exit 0
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