This file is indexed.

prerm is in llvm-4.0-runtime 1:4.0-1ubuntu1~16.04.2.

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

if test "$1" = "remove"; then
    if test -x /usr/sbin/update-binfmts; then
        update-binfmts --package llvm-4.0-runtime \
            --remove llvm-4.0-runtime.binfmt /usr/bin/lli-4.0 || true
        if test -f /var/lib/binfmts/llvm-4.0.binfmt; then
            # Purge old file
            update-binfmts --package llvm-4.0-runtime \
                --remove llvm-4.0.binfmt /usr/bin/lli-4.0 || true
        fi
    fi
fi