prerm is in dnscache-run 1:1.05-8ubuntu1.
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.
1 2 3 4 5 6 7 | #!/bin/sh
set -e
test "$1" = 'remove' || test "$1" = 'deconfigure' ||
test "$1" = 'failed-upgrade' || exit 0
update-service --remove /etc/sv/dnscache || :
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