This file is indexed.

/etc/init.d/single is in initscripts 2.88dsf-59.3ubuntu2.

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
### BEGIN INIT INFO
# Provides:          single
# Required-Start:    $local_fs $all killprocs
# Required-Stop:
# Default-Start:     1
# Default-Stop:
# Short-Description: executed by init(8) upon entering runlevel 1 (single).
### END INIT INFO

PATH=/sbin:/bin

. /lib/lsb/init-functions

do_start () {
	log_action_msg "Will now switch to single-user mode"
	exec init -t1 S
}

case "$1" in
  start)
	do_start
	;;
  restart|reload|force-reload)
	echo "Error: argument '$1' not supported" >&2
	exit 3
	;;
  stop|status)
	# No-op
	;;
  *)
	echo "Usage: $0 start|stop" >&2
	exit 3
	;;
esac