preinst is in ruby 1:2.3.0+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 | #!/bin/sh
set -e
update-alternatives --remove-all ruby 2>/dev/null || true
update-alternatives --remove-all gem 2>/dev/null || true
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