To type a indic language on Linux you need to do some work before you get it working and before we start I am assuming that you are using ubuntu Linux 10.04 or higher .
The first thing you need is to install ibus
so to install ibus open terminal and type
sudo apt-get install ibus
sudo apt-get install ibus-m17n
after installing ibus and m17n go to System->Administration->Language Support in the Gnome menu
Then go to System->Preferences->Keyboard Input Methods
then your preferred shortcut keys .
and now you can type தமிழ் (Tamil) !!
நண்றி வணக்கம் !
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