preinst is in openjdk-7-jre-lib 7u51-2.4.6-1ubuntu4.
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 | #! /bin/sh
set -e
if [ -h /usr/share/doc/openjdk-7-jre-lib ]; then
rm -f /usr/share/doc/openjdk-7-jre-lib
fi
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