This file is indexed.

postinst is in bison 2:3.0.2.dfsg-2.

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

case "$1" in
    configure|abort-remove|abort-deconfigure)
        update-alternatives --install /usr/bin/yacc yacc \
	    /usr/bin/bison.yacc 100 \
	    --slave /usr/share/man/man1/yacc.1.gz yaccman \
	    /usr/share/man/man1/bison.yacc.1.gz
        [ -e /usr/bin/yacc ] || update-alternatives --auto yacc
	;;

    abort-upgrade)
	# Nothing to undo
	:;
	;;

    *)
	echo "$0: Undocumented call: \"$@\"" >&2
	exit 1
	;;
esac