GNU Screen

 Screenrc

caption always
#caption string "%{kw}%-w%{wr}%n %t%{-}%+w"
caption string "%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %H %{..Y} %m/%d %C%a "

Ctrl-a : -- will take you to the GNU SCREEN command mode(vim kind of ex mode)

Ctrl-a :altscreen on/off -- To clear/not screen up on exiting from vim/less/man
Ctrl-a :number -- To renumber current terminal with newer one, incase a terminal exist with new number,
                  it   will take the current terminal number.
Ctrl-a :A -- To rename the current window
Ctrl-a :hardcopy -h [filename] -- copy entire contents of scrollback buffer
Ctrl-a :H       Begins/ends logging of the current window to the file "screenlog.n".
Ctrl-a :log [on|off] -- Begins/ends logging of the current window to the file "screenlog.n".
Ctrl-a :logfile filename -- Setting filename for logging.
Ctrl-a :logfile flush [secs] --  is used to set delay between each write to the logfile, by default it’s 10 seconds.

Configuring the Scrollback Buffer

By default, the scrollback buffer only keeps the last 100 lines of text, which is not enough for my typical interaction with Screen. I’ve found a setting of 5000 lines to be more than adequate for my usage. The number of scrollback lines can be configured in your $HOME/.screenrc file, by adding the following line:

defscrollback 5000

This sets the scrollback to 5000 lines.
You can also override this default value when starting screen using the -h [num] option, where num is the number of scrollback lines.
Finally, if you want to change the number of lines of scrollback for a single window, using the “scrollback” command. Hit C-a (Ctrl-A) : to go to the Screen command line and type scrollback num, where num is the number of scrollback lines.
In screen search to turn off case:
C-a :ignorecase off/on
Problem: GNU got struck because of mistakenly pressed "ctrl-s"
Solution: Ctrl+s “tells the system not to send any more data to the screen until a ctrl-q is pressed”. so pressing ctrl-q will solve the problem here :-)
References:
https://bbs.archlinux.org/viewtopic.php?id=55618
https://wiki.archlinux.org/index.php/GNU_Screen
http://www.samsarin.com/blog/2007/03/11/gnu-screen-working-with-the-scrollback-buffer/
http://www.gnu.org/software/screen/manual/screen.html
http://aperiodic.net/screen/commands:start 
http://superuser.com/questions/137714/using-screen-commands-like-less-and-man-dont-clear-the-screen-afterwards/137751#137751 
http://serverfault.com/questions/244294/gnu-screen-how-to-re-order-windows-change-the-scroll-shortcut-and-modify-th 
https://github.com/saltycrane/homedir/blob/master/etc/.screenrc