This file is indexed.

preinst is in tcl8.5-dev 8.5.11-1ubuntu1.

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

set -e

if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" lt-nl "0.b1-2"; then
    update-alternatives --remove tcl.m4 /usr/lib/tcl8.5/tcl.m4
    # We really want to remove this alternative
    update-alternatives --auto tcl.m4 >/dev/null || true
fi