[root@localhost ~]# runlevel

N 3

[root@localhost ~]# yum grouplist | more 

Loaded plugins: product-id, security, subscription-manager

This system is not registered to Red Hat Subscription Management. You can use subscription-

manager to register.

Setting up Group Process

Installed Groups:

   Additional Development

   Base

   Console internet tools

   Directory Client

   E-mail server

   Fonts

   Graphical Administration Tools

   Hardware monitoring utilities

   Java Platform

   Large Systems Performance

   Legacy UNIX compatibility

   Legacy X Window System compatibility

   NFS file server

   Network file system client

   Networking Tools

   PHP Support

   Performance Tools

   Perl Support

   Scientific support

   Security Tools

   Server Platform

   System Management

   System administration tools

   TurboGears application framework

   Web Server

[root@localhost ~]# vi /etc/inittab

# inittab is only used by upstart for the default runlevel.

#

# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.

#

# System initialization is started by /etc/init/rcS.conf

#

# Individual runlevels are started by /etc/init/rc.conf

#

# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf

#

# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,

# with configuration in /etc/sysconfig/init.

#

# For information on how to write upstart event handlers, or how

# upstart works, see init(5), init(8), and initctl(8).

#

# Default runlevel. The runlevels used are:

#   0 - halt (Do NOT set initdefault to this)

#   1 - Single user mode

#   2 - Multiuser, without NFS (The same as 3, if you do not have networking)

#   3 - Full multiuser mode

#   4 - unused

#   5 - X11

#   6 - reboot (Do NOT set initdefault to this)

#

id:3:initdefault: