This file is indexed.

postinst is in openjdk-7-jre-lib 7~u3-2.1.1~pre1-1ubuntu2.

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.

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#! /bin/sh

set -e

with_tzdata=yes

if [ "$with_tzdata" = yes ]; then
    if [ ! -h /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi ] && [ -d /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi ]; then
	rm -rf /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi
	ln -s ../../../../../share/javazi /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi
    fi
fi