preinst is in jruby 1.5.6-7.
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 | #! /bin/sh
set -e
if [ -d /usr/lib/jruby/share/ri/1.8/system ]; then
rm -rf /usr/lib/jruby/share/ri/1.8/system
fi
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