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Change default OS the hacker way

Well I had played with grub.cfg long time back but recently I had to install Ubuntu on my laptop which I rarely use ( as I believe kick ass developers don't work on laptop :P ) and especially with window$ on it.

So anyway , I installed Ubuntu but forgot to set the default OS to window$ , well you might be like

Yeah yeah , I tried persuading my family members to use Ubuntu but soon gave up on them :P.

A very shiny pearl of wisdom I have picked up is that , always create a backup of any config file you plan on tweaking.

So lets go ahead and make a original backup of the /boot/grub/grub.cfg file which will be changed to reset the default options.

cd /boot/grub/
sudo cp grub.cfg grub.cfg.org
sudo vim grub.cfg
search for set default with vim search i.e "/set default" this is generally line 13 in grub.cfg

All the entries in the grub are associated with "menuentry" keyword in grub.cfg , for setting the default to windows OS we need to find the menuentry number for windows , these menuentry starts with 0. If you are dual booted there are high chances that menuentry for windows would be 4.
here in my case it has to be 4 , so I can change my default OS to window$ by pointing the default to 4.
change the set default to the corresponding OS menuentry , for me it is