We have discussed Ubuntu basic system information in the previous post, Same as let us do in the CentOS, Fedora and RedHat.

Your CPU processor Model:

# grep -i 'model name' /proc/cpuinfo | uniq

model name      : Intel(R) Core(TM) i3-3110M CPU @ 2.40GHz

Find number of core processor :http://thelinuxfaq.com/manage/add-post.php
 
# lscpu

CPU(s):                4

Find out OS Version:

Centos:
 
# cat /etc/redhat-release

CloudLinux Server release 6.5 (Pavel Popovich)

RedHat:
 
# lsb_release -a

LSB Version:    :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: RedHatEnterpriseServer
Description:    Red Hat Enterprise Linux Server release 5.1 (Tikanga)
Release:        5.1
Codename:       Tikanga

(or)

# cat /etc/redhat-release

Red Hat Enterprise Linux Server release 5.1 (Tikanga)

Fedora :
 
# lsb_release -a
or
# lsb_release -a|grep Release
Release:        17
or
# cat /etc/redhat-release
Fedora release 17 (Beefy Miracle)
or
# cat /etc/issue.net
Fedora release 17 (Beefy Miracle)

 

Whether my system is 32 bit o 64 bit?
 
# python -c 'import struct;print( 8 * struct.calcsize("P"))'
32
# python -c 'import struct;print( 8 * struct.calcsize("P"))'
64

(or)
 
#uname -m (32 Bit)
i686
#uname -m (64 Bit)
x86_64  

(or)
 
# getconf LONG_BIT
32
# getconf LONG_BIT
64

Find Kernel Version:
 
# uname -r
2.6.32-71.29.1.el6.x86_64

# uname -r
3.5.3-1.fc17.i686

uname -r
2.6.18-53.el5

# uname -mrs
Linux 2.6.32-71.29.1.el6.x86_64 x86_64

# rpm -q kernel
kernel-2.6.32-71.29.1.el6.x86_64
kernel-2.6.32-431.11.2.el6.x86_64