Installing modelsim in Ubuntu 13.04 (Raring Ringtail)

Modelsim is an industrial standard HDL simulator.It can simulate VHDL, Verilog, SystemVerilog and SystemC.
Here I am descring the installation of modelsom altera starter edition in Ubuntu.
If is a free licence version of modelsim which would be a better starting point for a newbie.

1.You need to register on the site to download the package, so be patient and complete
   the registration process. Follow the link.

2.Now download the compressed installation package.  Follow the download link
   under ModelSim-Altera Starter Edition.



3.For windows installation .exe is provided and follow the steps as usual. For linux zip   file is provided.

  $ tar -xvf 12.1_modelsim_ase_linux.tar.gz

  It may not be set with the permission to execute, so make it executable and run.

  $ chmod +x script.sh ; ./script.sh

4.Enjoy coding !!