This file is indexed.

prerm is in zfs-dkms 0.7.5-1ubuntu15.

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

# Automatically added by dh_dkms/UNDECLARED
DKMS_NAME=zfs
DKMS_VERSION=0.7.5

case "$1" in
    remove|upgrade|deconfigure)
      if [  "$(dkms status -m $DKMS_NAME -v $DKMS_VERSION)" ]; then
         dkms remove -m $DKMS_NAME -v $DKMS_VERSION --all
      fi
    ;;
esac
# End automatically added section


if [ "$1" = "remove" ]; then
        rm -f /etc/zfs/zpool.cache
fi