postrm is in openjdk-8-jre-headless 8u162-b12-1.
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 9 10 11 12 13 14 15 16 17 18 19 | #!/bin/sh
set -e
multiarch=x86_64-linux-gnu
jdirname=java-8-openjdk-amd64
etcdir=/etc/java-8-openjdk
case "$1" in
purge)
if [ -z "$jdirname" ] || [ -z "$etcdir" ]; then
echo >&2 "$(basename $0): Internal error"
exit 1
fi
# removals of config files in /etc is handled by dpkg
# XXX should remove /etc/.java ???
;;
esac
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