This file is indexed.

postinst is in festival 1:2.1~release-6ubuntu1.

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

# Remove shutdown and reboot links; this init script does not need them.
if dpkg --compare-versions "$2" lt "1.4.3-18"; then
       rm -f /etc/rc0.d/K20festival /etc/rc6.d/K20festival
fi

# Create festival user if it doesn't already exist.
if ! getent passwd festival >/dev/null; then
       adduser festival --quiet --system --ingroup audio --no-create-home
fi