postrm is in apt-file 2.5.5ubuntu1.
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 8 | #! /bin/sh
# postremoval script for apt-file
set -e;
if [ "purge" = "$1" ]; then
rm -fr /var/cache/apt/apt-file/
rm -f /var/lib/update-notifier/user.d/apt-file-update
fi;
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