This file is indexed.

preinst is in autoconf2.13 2.13-62.

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 -e

for d in autoconf autoheader autoreconf; do
    dpkg-divert --package autoconf2.13 --add --rename \
		--divert /usr/bin/${d}2.50 /usr/bin/${d}
    dpkg-divert --package autoconf2.13 --add --rename \
		--divert /usr/share/man/man1/${d}2.50.1.gz \
			 /usr/share/man/man1/${d}.1.gz
done