Managing services

#http://www.mehrdust.com/archives/managing-services-in-ubuntu
#http://www.itmanage.info/technology/linux/ubuntu/enable%20disable%20service%20during%20start%20up%20in%20ubuntu.html

### Services start ###
/etc/init.d/myservice start/stop/restart
or,
service myservice start/stop/restart

### Getting a list of Services ###
ls /etc/init.d
service --status-all

ls -l /etc/rc?.d/*apache2
Runlevel 0: Halt System – To shutdown the system
Runlevel 1: Single user mode
Runlevel 2: Basic multi user mode without NFS
Runlevel 3: Full multi user mode (text based)
Runlevel 4: unused
Runlevel 5: Multi user mode with Graphical User Interface
Runlevel 6: Reboot System

### Adding a Service to Default runlevels ###
cp /etc/init.d/myscript.sh  << copy your script to /etc/init.d
chmod +x /etc/init.d/myscript.sh
update-rc.d myscript.sh defaults

update-rc.d apache2 defaults
or,
update-rc.d apache2 start 20 2 3 4 5 . stop 80 0 1 6 .

### Removing a Service from Default runlevels ###
rm /etc/rc*/*myscript
or,
update-rc.d -f apache2 remove