This file is indexed.

prerm is in libslepc3.6.1-dev 3.6.1.dfsg1-2build2.

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 -e

DEB_HOST_MULTIARCH=x86_64-linux-gnu

SLEPC_VERSION=3.6.1
SLEPC_ARCH=${DEB_HOST_MULTIARCH}
SLEPC_REAL_ARCH=${SLEPC_ARCH}-real

# Remove alternatives links
if [ "$1" = "remove" ]; then
  update-alternatives --remove slepc /usr/lib/slepcdir/${SLEPC_VERSION}/${SLEPC_REAL_ARCH}
fi