This file is indexed.

prerm is in libslepc3.7.4 3.7.4+dfsg1-2build8.

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=3.7.4
SONAME=3.7

# Remove alternatives links
if [ "$1" = "remove" ]; then
  update-alternatives --remove libslepc.so.${SONAME} /usr/lib/${DEB_HOST_MULTIARCH}/libslepc_real.so.${SLEPC_VERSION}
  update-alternatives --remove libslepc_real.so.${SONAME} /usr/lib/${DEB_HOST_MULTIARCH}/libslepc_real.so.${SLEPC_VERSION}
fi