This file is indexed.

prerm is in libpetsc3.6 3.6.2.dfsg1-3ubuntu1.

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
PETSC_VERSION=3.6.2
# use only major.minor as general soname (rather than major.minor.patch.build)
SONAME=$( echo ${PETSC_VERSION} | awk 'BEGIN { FS="."}; {print $1"."$2 }' )

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