prerm is in libruby1.8 1.8.7.352-2ubuntu1.
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
case "$1" in
purge|remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear|deconfigure)
if [ -w /usr/local/lib -a -e /usr/local/lib/site_ruby/1.8 ]
then
rmdir /usr/local/lib/site_ruby/1.8/x86_64-linux 2>/dev/null || true
rmdir /usr/local/lib/site_ruby/1.8 2>/dev/null || true
rmdir /usr/local/lib/site_ruby 2>/dev/null || true
fi
;;
*)
echo "postrm called with unknown argument \`$1'" >&2
exit 0
esac
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