Linux Running level

There 7 running level in Linux system:

• rc0.d - System Halted
• rc1.d - Single User Mode
• rc2.d - Single User Mode with Networking
• rc3.d - Multi-User Mode - boot up in text mode
• rc4.d - Not yet Defined
• rc5.d - Multi-User Mode - boot up in X Windows
• rc6.d - Shutdown & Reboot

To check which program are running at which level use command chkconfig --list.