This file is indexed.

postrm is in libbcprov-java 1.44+dfsg-3.1+deb7u1.

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

case "$1" in remove|purge)
    if which rebuild-security-providers >/dev/null; then
	rebuild-security-providers
    fi
esac