This file is indexed.

preinst is in bison 2:3.0.4.dfsg-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.

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#!/bin/sh

# On error, bomb out
set -e

# clean error from previous package.
rm -f /usr/share/man/man1/bison.1