/etc/init.d/inadyn is in inadyn 1.99.4-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127  | #!/bin/sh
### BEGIN INIT INFO
# Provides:          inadyn
# Required-Start:    $network $local_fs $remote_fs $syslog
# Required-Stop:     $network $local_fs $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: DynDNS client
# Description:       Register an Internet name with your IP address
### END INIT INFO
# Author: Timur Birsh <taem@linukz.org>
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="DynDNS client"
NAME=inadyn
DAEMON=/usr/bin/inadyn
CACHEDIR=/run/$NAME
PIDFILE=$CACHEDIR/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
DEFAULT=/etc/default/$NAME
CONFIG=/etc/$NAME.conf
[ -x $DAEMON ] || exit 0
[ -r $DEFAULT ] && . $DEFAULT
. /lib/lsb/init-functions
# Set defaults values if no DEFAULT exist
RUN_DAEMON=${RUN_DAEMON:-no}
USER=${USER:-debian-inadyn}
GROUP=${GROUP:-debian-inadyn}
if [ "$RUN_DAEMON" != "yes" ] && [ "$1" != "stop" ]; then
	log_action_msg "$NAME: Not starting. Disabled in $DEFAULT"
	exit 0
fi
DAEMON_ARGS="--pidfile $PIDFILE \
             --config $CONFIG \
             --background \
             --drop-privs $USER:$GROUP"
create_cache_dir() {
    # Create the cache empty dir if necessary
    if [ ! -d $CACHEDIR ]; then
        mkdir $CACHEDIR
        chmod 0755 $CACHEDIR
	chown $USER:$GROUP $CACHEDIR
    fi
}
do_start()
{
	start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
		|| return 1
	start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
		$DAEMON_ARGS \
		|| return 2
}
do_stop()
{
	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
	RETVAL="$?"
	[ "$RETVAL" = 2 ] && return 2
	rm -f $PIDFILE
	return "$RETVAL"
}
do_reload() {
	start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
	return 0
}
case "$1" in
  start)
    log_daemon_msg "Starting $DESC " "$NAME"
    create_cache_dir
    do_start
    case "$?" in
		0|1) log_end_msg 0 ;;
		2) log_end_msg 1 ;;
	esac
  ;;
  stop)
	log_daemon_msg "Stopping $DESC" "$NAME"
	do_stop
	case "$?" in
		0|1) log_end_msg 0 ;;
		2) log_end_msg 1 ;;
	esac
	;;
  status)
       status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
       ;;
  reload|force-reload)
	log_daemon_msg "Reloading $DESC" "$NAME"
	do_reload
	log_end_msg $?
	;;
  restart)
	log_daemon_msg "Restarting $DESC" "$NAME"
	do_stop
	case "$?" in
	  0|1)
		do_start
		case "$?" in
			0) log_end_msg 0 ;;
			1) log_end_msg 1 ;; # Old process is still running
			*) log_end_msg 1 ;; # Failed to start
		esac
		;;
	  *)
	  	# Failed to stop
		log_end_msg 1
		;;
	esac
	;;
  *)
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|reload|force-reload}" >&2
	exit 3
	;;
esac
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