This file is indexed.

prerm is in libpetsc3.4.2-dev 3.4.2.dfsg1-6.

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

# Remove alternatives links
if [ "$1" = "remove" ]; then
  update-alternatives --remove petsc /usr/lib/petscdir/3.4.2
  update-alternatives --remove math-blaslapack.m4 /usr/lib/petscdir/3.4.2/aclocal/math-blaslapack.m4
  # Somewhat inelegant, but there's no test for empty dir
  if [ -z "`ls /usr/share/aclocal`" ]; then
    rmdir /usr/share/aclocal
  fi
fi