Linux entry fourth day-service management

One, outline

　　　

II. Introduction and classification

　　1. Operating level

0-6 altogether 6 operating levels

0 -1 -2 - multi-user, but no  NFS3-  full multiuser mode, is the standard run level.  4 -5 - X11   6 - restart, run init 6 The machine restarts. Init is typically run automatically at system startup, or it can be called by the root user. Its role is to switch the operating state of the system. Its command format is: Init num〈 carriage return, where NUM represents any number from 1 to 6

Level 3 is our common character interface, level 7 is our standard graphical interface

Linux entry fourth day-service management