How to run a shell script at startup on Debian

The script file is in /etc/init.d/myscript

*** begin myscript file ***
#!/bin/bash
# /etc/init.d/myscript
#
### BEGIN INIT INFO
# Provides:          myscript
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Should-Start:      $network $time
# Should-Stop:       $network $time
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start myscript
# Description:       startup myscript
#
### END INIT INFO
#

/path/to/myscript

*** end myscript file ***

As root user we can use chkconfig to enable or disable the script at startup:
chkconfig --list myscript
chkconfig --add myscript