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===== Init =====

==== Runlevel ====
Configuration of runlevels:
  /etc/inittab

  init q                               #Updates the inittab file without reboot!
  id:5:initdefault:                    #Start in runlevel 5 als default

Start myprocess at runlevel 3:

  5:3:once:/etc/myprocess

Problems with X after update or other problems.
Solution: Add to /etc/inittab
  x:5:respawn:/etc/X11/prefdm -nodaemon

==== Init ====

Show runlevel:

  runlevel
  
Change runlevel:

  init value       #Value can be 1-6
  
Change runlevel on ubuntu:

  telinit value

Shutdown:

  init 6
  shutdown -k +3 Please save your work now!
  shutdown -r now
==== Initscript ====

Example: Nagios NRPE Agent

<code>
#!/bin/sh
### BEGIN INIT INFO
# Provides: nrpe
# Required-Start: $networking
# Required-Stop: $networking
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description: Nagios Remote Executor Plugin
### END INIT INFO

#####Variables#####
DIR="/usr/local/nagios/bin"


start() {
	echo "start nrpe"
	${DIR}/nrpe -c ${DIR}/nrpe.cfg -d -n
	ps ax --width=1000 | grep "${DIR}/nrpe" | cut -d " " -f1 | head -n 1 > /tmp/nrpe_process_count.txt
}
stop() {
	echo "stop nrpe" 
	nrpe_pid=`ps ax --width=1000 | grep "${DIR}/nrpe" | cut -d " " -f1 | head -n 1`
	kill $nrpe_pid
	rm /tmp/nrpe_process_count.txt
}

status() {

	if [ -f /tmp/nrpe_process_count.txt ]
	then
		read line < /tmp/nrpe_process_count.txt
		if [ $line -gt 0 ];
        	then
        	echo -n "nrpe ( pid "
        	ps ax --width=1000 | grep "${DIR}/nrpe" | cut -d " " -f1 | head -n 1
        	echo -n ") is running..."
		echo
		fi
	else
        echo "nrpe is stopped"
        fi
}

case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
#sleep 3
start
;;
status)
status
;;
*)
echo "Usage: nrpe {start|stop|restart|status}"
exit 1
esac
</code>

Example Tomcat:

[[Heartbeat:Tomcat6]]

==== Recover Root-Password Ubuntu Server 12.4 ====

Enter the Grub-Shell with "e", go to the very end of the line "linux", change the "ro" to "rw" and add 

  init=/bin/bash

press enter, then press F10 to boot your system. 
  
See also: https://help.ubuntu.com/community/LostPassword

==== Recover Root-Password SLES ====

Enter 

  init=/bin/bash
  
in grub-menu and boot (enter).