What is the support ''end of life'' for each CentOS release?

CentOS 3	CentOS-3 updates until Oct 31, 2010
CentOS 4	CentOS-4 updates until Feb 29, 2012
CentOS 5	CentOS-5 updates until Mar 31, 2014

 

From CentOS Site

How To Find Out The Version/Distribution Of Linux From Shell Prompt

cat /etc/*-release

or

lsb_release -d

Extract Pages From A PDF File

Install pdftk

$ pdftk CB.pdf cat 190-195 output vi_tutorial.pdf

I am extracting pages 190-195, from a pdf file called CB and I am naming the output file as vi_tutorial

Access Hotmail Through Evolution

Receiving(POP) Mail

    Server Type: POP
    Server: pop3.live.com (Port 995)
    Username: johndoe@hotmail.com
    Use Secure Connection: SSL encryption
    Authentication: Password Authentication


Sending(smtp) Mail

    Server: smtp.live.com (Port 25 or 587)
          Note: Some ISPs block port 25, if you are having a problem sending mail, substitute smtp.live.com:587 for the server information above.
    Server requires authentication: Checked
    Security: TLS encryption
    Authentication: Plain or Login
    Username: johndoe@hotmail.com

Post-Installation

Post-Installation

1. Login as root and add the normal user to Sudoers
1. visudo
2. Below root=(ALL) ALL, add the user
3. Press "Escape" followed by "ZZ" to save the file and exit
2. Install yum-priorities
1. yum-priorities & rpmforge 
3. Edit repos
4. Add rpmforge
5. Check package exclusion/plugin priority
6. Install fuse fuse-ntfs-3g
1. fuse fuse-ntfs-3g & Mount 
7. Mount NTFS drives
8. Install multimedia support
1.  Play MP3s
9. Install flash, firefox addons, torrent client, & ftp client

Connect BSNL EVDO ZTE AC8700 To Internet

Install the 3 RPMs.
1. libstdc++-4.3.2-7.i386.rpm
2. qt45-4.5.2-1.el5.pp.i386.rpm
3. ztemtEVDO-1.1-8.i586-fedora9.rpm

Probe for the modem, start evdo interface, enter the username and password to connect to internet

su
/sbin/modprobe usbserial vendor=0x19d2 product=0xfffe
dmesg | tail
ztemtevdo
Add the username and password
Connect to internet now.

Turn Num Lock key on

This can be done through 2 steps.

1. Install "numlockx" 
2. Edit the /etc/gdm/Init/Default file

Install numlockx through terminal using this command
sudo yum install numlockx

Edit the /etc/gdm/Init/Default file through Gedit using this command in a terminal
sudo gedit /etc/gdm/Init/Default

In the file which opens, above exit 0, paste the lines below

if [ -x /usr/bin/numlockx ]; then
/usr/bin/numlockx on
fi

Save the file and exit.

Next time you reboot, num lock will be on by default

Gnome shortcut keys

Alt + F1: Open the Main Menu

Alt + F2: Open the Run Program dialog

F1: Display help

Alt + F4: Close the window

Alt + F10: Maximize the window

Alt + F5: Restore a maximized window to the original size of the window

Ctrl + F1: If the focused desktop element is a panel or application window, this keyboard shortcut switches the display of tooltips for the window or panel objects on and off

Shift + F10: Open a popup menu for the desktop element that has focus, if a popup menu exists

What is CentOS?

CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by a prominent North American Enterprise Linux vendor.

You can know more about CentOS at these sites
http://www.centos.org/
http://distrowatch.com/table.php?distribution=centos