Add common status and disable commands

Guides/service.md

@@ -1,3 +1,19 @@
 # Service
 
 Tips to use services under Linux.
+
+## List all services
+
+`service --status-all`
+
+## Status of one specific service
+
+`service <name of service> status`
+
+Example : `service mongodb status`
+
+List of common services : `postgresql`, `apache2`, `mongodb`
+
+## Disable a service
+
+Example : `sudo update-rc.d mongodb disable`