postrm is in libwrap0 7.6.q-27.
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 | #!/bin/sh -e
if [ "$1" = "purge" ] && \
[ "$(dpkg-query --show libwrap0 2> /dev/null | wc -l)" = 1 ]; then
rm -f /etc/hosts.allow /etc/hosts.deny
fi
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