This file is indexed.

/etc/wide-dhcpv6/dhcp6c-ifupdown is in wide-dhcpv6-client 20080615-11.1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
# Updates information whenever a network interface is brought up.

[ "$IFACE" = "lo" ] && exit 0
[ -r /etc/default/wide-dhcpv6-client ] || exit 0
[ -x /usr/sbin/dhcp6ctl ] || exit 0

# Check if dhcp6c is running
pidof dhcp6c > /dev/null 2>&1 ; [ $? -eq 1 ] && exit 0

. /etc/default/wide-dhcpv6-client

case $MODE in
    start|stop)
        for i in $INTERFACES ; do
            if [ "$IFACE" = "$i" ] ; then
                /usr/sbin/dhcp6ctl $MODE interface $IFACE
                exit 0
            fi
        done
    ;;
    *)
        if [ "$VERBOSITY" = "1" ] ; then
            echo "dhcp6c-ifupdown: unknown mode \"$MODE\""
        fi
        exit 1
    ;;
esac