postrm is in libgcj14 4.8.5-4ubuntu2.
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 | #! /bin/sh -e
case "$1" in
remove|purge)
# only purge if no other library is installed.
if [ -z "$(ls /usr/lib/libgcj.so.14* 2>/dev/null)" ]; then
rm -f /var/lib/gcj-4.8/classmap.db
rmdir --ignore-fail-on-non-empty /var/lib/gcj-4.8 2>/dev/null || true
fi
esac
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